Health Meaning

Behind the epidemic without previous Ebola in West Africa is a species with an incredible power to exceed its host. Zaire ebolavirus and the filovirus family to which it belongs must virulence mechanisms that first disarm the immune response and then dismantle the vascular system. The virus progresses so rapidly that researchers are struggling to unravel the precise sequence of events, especially in the midst of an epidemic. Much is still unknown, including the role of some of the seven proteins that the virus RNA, AOS is diverting the machinery of host cells and the type of immune response needed to defeat the virus before it spreads throughout the body. But researchers can test how different live virus attacks cells in culture and can observe the progression of disease, AOS in primates, AIA nonhuman model almost identical to humans.

Here are some basic things that we understand how Ebola and humans interact.

What do the Ebola virus for the immune system?

Once the virus enters the body, it has several types of immune cells that are the first line of defense against invasion. The virus infects dendritic cells, which normally have signals of an infection on their surfaces to activate lymphocytes, Äîthe T white blood cells that can destroy other infected cells before the virus replicates further. With defective dendritic cells not giving the right signal, the T cell donation, AOT respond to infection, and do the antibodies that depend on them for activation. The virus can begin replicating immediately and very quickly.

Ebola, like many viruses, works in part by inhibiting molecule type interferon, AIA that cells use to prevent further viral reproduction. In a new study published today in Cell Host & Microbe , the researchers found that one of the Ebola protein, AOS, called VP24 binds to and blocks a transport protein on the surface of immune cells that plays an important role in the pathway of interferon.

Curiously, themselves donation lymphocytes, AOT be infected, but a series of other lack factoring, AIA stimulation of certain cells and toxic to others signals Äîprevent these primary immune cells to a fight.

How Ebola cause of bleeding?

As the virus moves into the bloodstream to new sites, other immune cells called macrophages eat up. Once infected, they release proteins that trigger the coagulation, forming small clots through the blood vessels and reducing blood supply to the organs. They also produce other inflammatory signaling proteins and nitric oxide, which damage the wall of blood vessels, causing a leak. Although this damage is one of the main symptoms of infection, all patients will exhibit hemorrhaging, external Äîbleeding eyes, nose or other orifices.

Does the target of some of the organs virus?

Ebola triggers inflammation and system fever and can also damage many types of tissue in the body, either by tricking the immune cells such as macrophages to release inflammatory molecules or by direct injury : invade cells and consume in. But the consequences are particularly deep in the liver, where Ebola erases cells necessary to produce coagulation proteins and other important components of plasma. Damaged cells in the gastrointestinal tract lead to diarrhea which often puts patients at risk of dehydration. And in the adrenal gland, the virus paralyzes the cells that make steroids to regulate blood pressure and causes circulatory failure that can starve the oxygen of organs.

What finally kills Ebola patients?

damage to the blood vessels leads to a drop in blood pressure, and patients die of shock and multiple organ failure.

Why do some people survive infection?

patients fare better with supportive care, including rehydration orally or intravenously that can buy time for the body to fight infection. But studies on blood samples from patients during the outbreak in 00 of a different Ebola strain in Uganda have also identified genes and other markers that seem to be a predictor of survival. Patients who have recovered higher levels of activated T cells in the blood, and there was some variants of a gene coding for surface proteins as white blood cells use to communicate. Earlier this year, researchers found a new association between survival and levels of sCD40L, a protein produced by platelets that could form part of the body attempt, AOS to repair damaged blood vessels. The authors note that the markers as sCD40L could suggest new therapies that increase the most important mechanisms for the repair of survival

* Correction, August 15, 1:51 p.m. :. This article has been corrected to note that nitric oxide, nitrous oxide does, damages blood vessels

* Ebola files :. Given the current Ebola epidemic, unprecedented in terms of the number of people killed and the rapid geographic spread, science and Science Translational Medicine made a collection of research articles and news on the viral disease available for researchers and the general public.

When President Barack Obama spoke about the US military helping fight the Ebola epidemic on Meet the Press NBC News this past Sunday, Tim Flanigan, an American clinician working in Monrovia, said he was "ecstatic". It was exactly what most people who run the Ebola efforts in Liberia, the hardest hit country, had hoped. But joy turned to dismay the next day when Flanigan has learned the details of the Pentagon's plans.

Obama promised "to get military US assets just to set up, for example, isolation units and equipment there to ensure security for the public health workers outbreak everywhere. "on Monday, a representative of the Pentagon said the army planned to send only field hospital with 25 beds for $ 22 million in Monrovia, Liberia's capital." He will not make a dent in the treatment of Ebola for the people of Liberia, "Flanigan warns." It is such a small number of beds and they can thus be directed to non-Liberians. "

Flanigan, who works at Brown University 1999-2012 and headed the Division of Infectious Diseases, he arrived in Monrovia on September 1 and plans to stay for two months. A Catholic deacon, he also works with faith-based groups focused on health and blogging about his experience.

Flanigan said Liberia and officials and international workers, he spoke with the US military had planned to set up field hospitals that have the ability to help up to 400 people. there is a great shortage of beds for patients with Ebola in the nation, and standard care is the same shortage for people who are admitted to what is called Ebola treatment units. News that just one small facility would come was disheartening, he said, given the expectations.

"the US military has the capacity and know -How and training and infectious disease experts are incomparable to come and establish an Ebola treatment unit that would be able to take care of a large number of patients, "he insists.

for the US military, it is "a top priority" for the "deployable field hospital" in Monrovia and "we expect to get there quickly," wrote Navy Cmdr. Amy Derrick-Frost, a spokesman for the US Department of Defense (DOD), in an e-mail to Science Insider. The Army is also working with partner agencies, including centers for the US Agency for International Development- Disease Control and "to assess the situation in affected areas to determine what other needs and necessary or required resources "Derrick-Frost wrote.

A deployable field hospital can be moved on pallets by air and quickly implemented, which plans to do before replacing the Liberian government DOD. "The purpose of this piece of equipment is to provide an installation that health workers in the affected area can use for themselves if they become sick or injured," writes Derrick-Frost.

Flanigan said a US military stronger response could help solve another problem coming the health care system badly fractured Liberia can not answer. There is a pressure to treat patients Ebola with the blood of people who survive disease and perhaps give people infected untested medicines, as well as a separate effort that can offer experimental Ebola vaccine to health workers and other first responders. But hospitals and clinics are not not currently the ability to collect blood samples and tissue necessary to study the impact of these interventions, Flanigan said. "we will not learn what we desperately need to know about the treatment and prevention of this disease" he said. "It is not in the best interest of the Liberian people, West Africa, or the Americans."

* Ebola files: Given the current Ebola epidemic, unprecedented in terms of the number of people killed and rapid geographic spread, science and science Translational Medicine made a collection of research articles and news on the viral disease available for researchers and the general public.

Marc September 16, 2014 as the day the United States declared all-out war on the Ebola epidemic raging in West Africa.

As President Barack Obama said in remarks he made today to the US Centers for Disease Control and Prevention (CDC) in Atlanta, the world is looking to the US for 'help. "It is a responsibility that we embrace," said Obama. "We are ready to take leadership on this to provide the kinds of capabilities that only America has, and mobilize the world so that only America can do. this is what we are doing as we speak. "

at the same time, Obama spoke in Atlanta, the uS Senate held an Ebola audience who presented the testimony of senior officials of public health and can -being the most famous survivor of the world Ebola, Kent Brantly, who fell ill with the disease while treating patients in Liberia in July. "We must take the dangerous threat of deadly Ebola outbreak as seriously as we take ISIS [Islamic State in Iraq and Syria]," said Senator Lamar Alexander (R-TN).

The centerpiece of what Obama called "a significant increase in our response" is in fact the US military, which in cooperation with the Liberian government will put up a command center in Monrovia run by US army Maj. Gen. Darryl Williams. As explained by Obama, the army will set up a command and control, logistics and engineering support for civil society organizations working in the region. "Our armed services are better that any organization on Earth," Obama said.

The US response will focus on providing beds for patients who Ebola are almost non-existent in Liberia-isolation areas to keep people when Ebola treatment units not to space, more trained health care workers, an airlift to move people and equipment in West Africa faster, and kits to help families with infected people in the house at the time of care for a sick person and protect themselves against infection. "We can not dawdle on this one," said Obama, who urged global communities to dramatically step response, too. "International organizations just have to go faster than they up to this point. "(this fact sheet explains the details of the response of the United States overhauled.)

in the 3-hour-long Senate hearing-which, an unusual move, was organized jointly by a subcommittee of the appropriations and the health Committee, education, labor and pensions, topics ranged from financing the efforts of the need for a greater sense of urgency, health public and scientists, and personal experiences issues. Beth Bell, who heads CDC's National Center for emerging and zoonotic infectious diseases, described the epidemic in Liberia, Sierra Leone and Guinea as "fierce and spread exponential, "so severely crippling the health care systems in some places that malaria can not be treated and infants can be safely delivered.

report the current situation of the World Health Organization estimated that there were nearly 5,000 cases, almost half of them died, but Bell said CDC estimates that "the actual numbers would be two to three times higher." She pointed out that we have the tools to end this epidemic, but the window of opportunity closes. "If we do not react now to stop the Ebola virus we could be dealing with it for years to come affect larger areas of Africa," she said.

The senators asked repeatedly Anthony Fauci, director of the US National Institute of allergy and infectious diseases, if the Ebola virus could mutate into a more dangerous form and even spread in the air. "We see that carefully," Fauci said. He explained that, as all the RNA viruses, one that causes Ebola made many mistakes when it copies itself, but most of these mutations do nothing. "It is an unusual situation where a mutation will completely change the way a virus spreads," said Fauci, stressing that it was impossible, but very unlikely. "What is likely is that if we do not do what we do now, in the direction of a main ramp of infection control capacity, including what we mean to get heavily involved in all military things they bring to the table ... it will get worse, "Fauci said. "A virus does not replicate can not mutate."

The Ministry of Defense of the United States hopes to reschedule $ 500 million to Ebola efforts. The Obama administration has asked Congress to pass a continuing resolution that will give $ 30 million dollars more to the CDC for use until 11 December, and $ 58 million to the Department of Health and Human Services to support the development of experimental vaccines and treatments. The continuing resolution passed the House of Representatives, and Senator Tom Harkin (D-IA), who chaired the hearing of the Joint Committee, said he hopes the Senate to pass the "the next day or two." But Harkin and others stressed that more money will be needed for the budget for year 2015. "I hate to say this, but Ebola will not be defeated within 10 weeks of the continuing resolution."

Harkin and other senators were surprised by the lack of a clear leader for American global effort against Ebola. "I'm a little surprised to see that," said Harkin. Senator Barbara Mikulski (D-MD) said this was a matter that the Senate should take with Obama. "We need someone points," said Mikulski. "If we wanted to meet on responsible person who would on person in charge?"

The hearing ended with testimony and questions Brantly, an American physician with Samaritan's purse was airlifted to Monrovia to Atlanta for care state-of-the-art and is well today. Brantly, who met Obama in the Oval Office this morning, spoke of the many people he treated who have died of Ebola virus and the urgent need for other countries health workers to go help in Africa Where is.

"Many, including one of the senators today, used the analogy of a fire out of control to describe this epidemic of unprecedented Ebola," said Brantly. "Indeed, there is a fire. It is a straight line to the fire pit of hell. We can not deceive us into thinking that the great moat from the Atlantic Ocean to protect us against the flames of this fire. instead, we must act quickly and immediately to deliver the promises that were made and to be open to innovative practices interventions. this is the only way to keep whole nations to be reduced to ashes "

* Ebola files :. Given the current Ebola epidemic, unprecedented in terms of the number of people killed and the rapid geographic spread, science and Science Translational Medicine made a collection of research articles and news on the viral disease available for researchers and the general public.

In response to the "devastating epidemic" in West Africa Ebola, US National Institutes of Health ( NIH) Director Francis Collins announced "extraordinary measures to accelerate vaccine clinical trials."

During a conference call this morning, Collins and Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases (NIAID) of the NIH, described several studies of different human Ebola vaccine that will begin in the coming months. None of these clinical trials will determine whether vaccines work. Instead, the goal will be to determine if they are safe and stimulating immune responses. Several Ebola vaccines have been tested in humans, but none has advanced large-scale efficacy studies.

The first trial will begin next week at the NIH Clinical Center in Bethesda, Maryland. The vaccine, a vaccine developed by GlaxoSmithKline, Research Center, NIAID contains genes for surface protein from two strains of the Ebola virus, including the Zaire now sewn West Africa in an adenovirus that infects chimpanzees. As explained Fauci, the chimpanzee adenovirus does not copy, but acts as a vehicle and provides Ebola genes to human cells, which must then make proteins that trigger an immune response. The vaccine has shown "very good protection" in monkey tests, Fauci noted.

This first study will involve 20 volunteers who will receive the vaccine at two different doses. Fauci said researchers hope to have initial data available by the end of the year, although the study will follow participants for 48 weeks. In October, NIAID will begin testing with a simpler version of the same monovalent vaccine containing only a surface protein gene of the Zaire strain of Ebola virus.

Fauci said testing monovalent vaccine soon begin in England, Mali and Gambia in collaboration with a consortium in the UK which includes the Wellcome Trust and the Medical Research Council of this country. These same tests that test the safety and immune responses. The three studies all involve 140 people.

Mali and Gambia currently has no cases of Ebola, and Fauci said they were chosen because they had the infrastructure to carry out the studies. The three West African countries most affected by the current outbreak, Liberia, Guinea and Sierra Leone- "would not allow the kind of careful Phase I want to do," said Fauci. Nigeria, which is also affected by the current epidemic is another possible site for the live vaccine studies I, he added.

a phase I study with a different vaccine, one that uses the vesicular stomatitis virus as a vector to deliver genes Ebola, also will begin this fall, Fauci said. human trials of this vaccine, developed by public health Agency of Canada, will be held at the Walter Reed Army Institute of research in Silver Spring, Maryland.

Fauci stressed that these first small studies are designed to ensure that these potential vaccines do not cause damage. "I fooled enough in my many years of experience in infectious diseases and vaccinology that you can not really predict what you might see, "said Fauci. "The worst thing ... is to leave something well before you've even tested a minimum of security. This would violate the scientific principles and, in many ways, even ethical principles "

* Ebola files :. Given the current Ebola epidemic, unprecedented in terms of number of people killed and the rapid geographic spread, science and science Translational Medicine made a collection of research articles and news on the viral disease available for researchers and the general public.

With the popularity of smart watches and fitness leaders, the revolution in mobile technology is just beginning. Then the diagnosis can be "skin like" can monitor the health of your heart. The researchers reported online last week in Nature Communications they created an ultra-thin, flexible timbre 5 square centimeters (photo) that when placed on the skin monitors blood flow underneath, which can reveal changes in heart health. The patch contains a table of 30 small appliances "thermochromic" LCD that change color with temperature. imaging sensors and computer algorithms then translate the color scheme in a temperature profile (see above), and a health report. Because patches can be worn 24/7, they could provide monitoring patients around the clock health at risk.

Ebola fears interfere with the scientific world first meeting on tropical diseases. Today, Louisiana officials state health asked someone who has traveled to Liberia, Sierra Leone or Guinea in the last 21 days, or treated Ebola patients also stay away from the annual meeting of the American Society of Tropical Medicine and Hygiene (ASTMH), which begins Sunday in New Orleans.

ASTMH not known exactly how many scientists will be affected, but there are several, said the new president Christopher Plowe, including representatives of the World Health Organization (WHO) and the US Centers for Disease Control and Prevention (CDC). "They are very disappointed," said Plowe, a malaria researcher at the University of Maryland School of Medicine in Baltimore. ASTMH sent all registrants answering email today containing a letter from Kathy Kliebert, secretary of department Louisiana health and hospitals, and Kevin Davis, director of the Governor's Office of Homeland Security and Emergency Preparedness, which describes the position of the State. ASTMH referred enrolled in the health department of the State for more information.

"Since the conference participants with a travel history and exposure to [Ebola] are recommended not to participate in large groups (such as conference) or use public transportation, we see no utility in travel to new Orleans simply limited to your room, "said the letter.

new policy from Louisiana goes further than the CDC guidelines; It is the latest example, after New York and New Jersey, the state decided to impose restrictions that many scientists say little sense.

"I'm very angry. And that's an understatement," says Piero Olliaro, an expert in the WHO Tropical Diseases and visiting professor at Oxford University in the UK, who learned this afternoon that he can not get to New Orleans. Olliaro Guinea back on October 22, where he had been scouting for the sites to conduct clinical trials of drug candidates Ebola. When ASTMH meeting was scheduled to co-chair a session, give two lectures, and present six posters. he says he is struggling to find people to replace.

"This policy is fundamentally flawed and not based on evidence," says Daniel Bausch, a researcher at the School of public health from Tulane University and tropical medicine in New Orleans, which is the organizer of one of two specialized symposia Ebola at the meeting. "It is very regrettable and could be cons-productive by preventing health workers from Liberia, Sierra Leone and Guinea to share experiences and findings in one of the most important meetings of the tropical disease globally, "adds Peter Hotez, dean of the national School of Tropical Medicine at Baylor College of Medicine in Houston, Texas.

Plowe said he made phone calls to state officials late into the night, the last day to obtain clarity on the Louisiana policy in the Ebola time for the meeting this year. "The last thing we wanted was for people to travel to New Orleans only to find that they will be quarantined for 21 days," he said. Louisiana has the right to make its own policies, Plowe said: "That's the way it is, we have to live with.". ASTMH but believes that the best way to protect Americans is to fight against Ebola in West Africa, he adds, and steer clear of health workers who are not involved in patient care " does not contribute to it, and finally puts them at higher risk Americans, "he said.

Just how to limit the spread of the Ebola virus in the United States became the subject of intense political debate in the midst of an election season. in the complex new interim guidelines of CDC published yesterday , people who have traveled to countries with widespread Ebola transmission, but are not not come into direct contact with patients, are in the "low (but not zero) risk" category; the same is true for those patients treated with Ebola by using personal protective equipment (PPE) in countries have seen a few cases, such as the US, Germany or Spain. As long as they have no symptoms, they can move freely, and there is no reason to prevent the rallies, said CDC.

People who have treated patients Ebola by using protective equipment in Sierra Leone, Guinea, Liberia or fall into the category "some risk" for which "surveillance direct "is recommended, including daily temperature measurements by health officials, in addition, the local authorities' active may consider additional restrictions," said CDC. (The definitions of the different categories of risk here .)

This gives the government a considerable margin, and some have decided to take a strict position. In their letter, Kliebert and Davis say that the state would not be able to determine the level of risk in particular for any traveler; instead, we should rely on self-reporting. To err on the side of caution, Louisiana same request of people who fall into "low (but not zero) risk" category of the CDC to stay away. "In Louisiana, we like to welcome visitors, but we must find a balance that hospitality protection Louisiana residents and other visitors, "said the letter.

Kliebert and Davis seem to recognize that the prohibition is not much scientific sense, however. "From the medical point of view, asymptomatic individuals are not risk exposing others," they write. "These precautions are taken from an abundance of caution for the current situation, and certainly do not reflect a lack of appreciation for your service and sacrifice in efforts to treat and stop the [Ebola] epidemic.

"in an abundance of caution ... I came to hate that term," said Bausch. "it means based on evidence, it is not, there is no science to support it, but we'll do it anyway "

Olliaro said he did not treat patients in Guinea, but walked around Ebola treatment units in a protective suit, which would probably put it in CDC "category .. a little risk" in the UK, however, it is supposed to monitor themselves, their travel is not limited and can go to meetings.

session Bausch at the ASTMH meeting will be a broad overview of the state of the epidemic Bausch time both traveled to West Africa itself, but not in the last 21 days. he is not sure if anyone in his panel. Another session at the meeting will be focus on new drugs and vaccines . ASTMH said it will refund conference fees for registrants who decide to cancel their trip due to the Ebola Policy Louisiana.

"We hope that you will consider another visit to New Orleans," Kliebert and Davis say at the end of their letter, "when we can welcome you properly."

* Ebola files: Given the current Ebola epidemic, unprecedented in terms of the number of people killed and the rapid geographic spread, science and science Translational Medicine made a collection of research articles and news on the viral disease available for researchers and the general public.

Life on Earth is closely linked to natural cycles of light and darkness that make up a 24-hour day. For plants, animals and even bacteria, these circadian rhythms control many biological functions. Humans may ignore their body clocks, but at a price: the people whose circadian rhythms are regularly disrupted by jet lag or frequent shift, for example, are more vulnerable to diabetes, obesity, cardiovascular disease and cancer. There are several theories to explain these associations, and researchers now have a new player to consider: the bacteria that live in the digestive tract. According to a study in mice and a small group of human volunteers, the internal clocks of these gut microbes synchronize with the clocks of their hosts. When our circadian rhythms are out of whack, and those of our bacteria.

Recent years have seen an explosion of interest in the constellation of bacteria that call home to the gut, and these microbes appear to play a role in any of immunity metabolism mood. But although the broken bacteria are observed in many of the same diseases that arise from asymmetric circadian rhythms, the exact link is not fully understood. Eran Elinav a specialist and immunologist microbiome at the Weizmann Institute of Science in Rehovot, Israel, wondered if microbes own circadian rhythms were a missing piece of the puzzle.

To test the theory, he and his colleagues analyzed the bacteria in fecal samples of laboratory mice maintained normal 12-hour cycles of light and darkness. Samples were taken every 6 hours for two cycles of 24 hours. Up to 60% of the microbes is composed of different types of bacteria that fluctuated in both the number and frequency with respect to each other, throughout the day and night. During the dark phase (when mice are nocturnal, are most active) bacteria are digesting nutrients busy repairing their DNA, and growth, as shown by the different activity of the bacterial gene documented from fecal samples collected at different time points. During the light phase, microbes went on ongoing process "housekeeping" such as detoxification, detection of chemicals around them, and the construction of the flagella, or tails, which help microbes move.

In mice with a mutation that disables the internal clock, gut bacteria do not show the same changes in both population and activity in response to light and darkness , suggesting that the animal of clock control in some way that of bacteria. When bacteria from these mice "no clock" were transplanted into healthy animals living in normal light-dark conditions, microbes began showing normal rhythms in a week.

The results, reported online yesterday in Cell came as a surprise, said Elinav. Previous studies have shown that many bacteria have circadian clocks cyanobacteria sensitive to light, for example, which derive their energy from photosynthesis. But the deep microbes in well guts, entrails-spend all their time in the dark. How did they know what time of day it was? Some signal must pass the host bacteria.

A major difference between normal mice and those of the clock was disabled when the animals ate, the researchers found. Normal mice eat at night when they are active; mice without clock ate almost continuously. So could mealtime is the signal? When the researchers changed the eating habits of animals by normal feeding mice during the light cycle (the night of a mouse), numbers, types, and activity of bacteria and displaced. The researchers also found that mice whose light-dark cycles were disrupted gained weight and developed physiological changes associated with diabetes, such as insulin resistance. Because humans with irregular sleep patterns also tend to eat more at night, researchers suspect that these eating habits contribute to disease specifically disrupting gut microbes.

The bacteria are probably not the whole story; irregular sleep and eating may contribute to the disease through other channels, such as excess stress hormone and insulin production. Although, "This is a compelling study," says microbiologist Rob Knight of the University of Colorado, Boulder. Knight said some of the strongest evidence for a role of bacteria in the circadian related diseases is the final phase of the study, when the research team analyzed fecal samples from two people on a normal schedule and two others who had recently stolen from the United States to Israel. Analysis of the samples before, during and after the fighting jet lag, they found similar bacteria fluctuations in what they saw in mice. jetlag of participants showed an increase in a type of bacteria known to be more common in people with diabetes and obesity; the levels of these microbes have dropped to normal once the travelers adjusted to the new time zone.

The most compelling of all, Knight believes, is that when samples of gut bacteria of human jetlag were transplanted into healthy mice, the animals gained weight showed an increase blood sugar, body fat and had a higher content compared to animals receiving the bacteria participants before their flight.

so we can ward off evil effects of jet lag by being more careful about how or when we eat? At this point, "he is an educated guess," said Elinav.