A team of researchers discovered that hepatitis A virus does not have an envelope when found in the environment, but acquires one from the cells that it grows in within the liver. It circulates in the blood completely cloaked in these membranes.
China announced a sixth death from a new bird flu strain Friday, while authorities in Shanghai halted the sale of live fowl and slaughtered all poultry at a market where the virus was detected in pigeons being sold for meat.
A middle-aged man who transported poultry for a living has died from a new strain of bird flu, the fourth death among 11 confirmed cases in China, the government and state media reported today.
Another unidentified person has died from a new strain of bird flu, bringing the death toll to five among 14 confirmed cases in China, the government and state media reported Thursday. The official Xinhua News Agency did not identify the fifth fatality, but said that person also died in Shanghai on Wednesday.
Scientists taking a first look at the genetics of the bird flu strain that recently killed two men in China said Wednesday that the virus could be harder to track than its better-known cousin H5N1 because it might be able to spread silently among poultry without notice.
A new global plan aims to end most cases of polio by late next year, and essentially eradicate the paralyzing disease by 2018— if authorities can raise the $5.5 billion needed to do the work, health officials said.
Using the same strategy that a common virus employs to evade the human immune system, researchers have modified adult stem cells to increase their survival– with the goal of giving the cells time to exert their natural healing abilities.
A new study defines previously unknown properties of transmitted HIV-1, the virus that causes AIDS.
Researchers have shown how the innate immune system distinguishes between dangerous pathogens and friendly microbes.
Health officials say they still don't understand how a lesser-known bird flu virus was able to kill two men and seriously sicken a woman in China, but that it's unlikely that it can spread easily among humans. Two men in Shanghai became the first known human fatalities from the H7N9 bird flu after contracting it in February.
Health officials say at least 24 people have become sick from an outbreak of E. coli infections linked to frozen snack foods marketed to children. No one has died, but eight people, mostly kids or teens, were hospitalized.
A team of scientists has unveiled a new technique for vaccine design that could be particularly useful against HIV and other fast-changing viruses.
A new study provides novel insight into how an emerging strain of the diarrhea-causing bacteria E. coli interacts with its host.
Until now most experimental vaccines against the highly lethal H5N1 avian influenza virus have lacked effectiveness. But a new vaccine has proven highly effective against the virus when tested in both mice and ferrets.
Scientists have confirmed that the pathogen that causes Lyme Disease— unlike any other known organism— can exist without iron, a metal that all other life needs to make proteins and enzymes.
More than three quarters of new, emerging or re-emerging human diseases are caused by pathogens from animals, according to the World Health Organization. But a widely accepted theory of risk reduction for these pathogens– one of the most important ideas in disease ecology– is likely wrong, according to a new study.
Don't look for testing of the anthrax vaccine to begin in children any time soon. Controversy arose last year as experts debated whether such studies should be done to learn how to treat children in case of a bioterror attack.
Public health agencies in five states are assessing the rabies risk for hundreds of people who may have had close contact with an infected organ donor and four transplant recipients, one of whom died, officials said Saturday.
A potentially lethal fungal infection appears to gain virulence by being able to anticipate and disarm a hostile immune attack in the lungs, according to findings by researchers.
Researchers report that influenza virus-specific CD8+ T cells or virus-specific non-neutralizing antibodies are each relatively ineffective at conferring protective immunity alone. But, when combined, the virus-specific CD8 T cells and non-neutralizing antibodies cooperatively elicit robust protective immunity.
Vaccines that employ weakened but live pathogens to trigger immune responses have inherent safety issues but researchers have developed a new trick to circumvent the problem— using bacteria’s own cellular mistakes to deliver a safe vaccine.
Immune system B cells play a crucial role in the defence of pathogens: When they detect such an intruder, they produce antibodies that help to combat the enemy. They concurrently and continuously improve these molecules to more precisely recognize the pathogens.
Nanoparticles carrying a toxin found in bee venom can destroy human immunodeficiency virus (HIV) while leaving surrounding cells unharmed, researchers have shown.
Biomedical engineering researchers have encapsulated two types of protein antigens in chitosan and demonstrated that the combined material enables or improves three important immune responses.
A baby born with the AIDS virus appears to have been cured, scientists announced Sunday, describing the case of a child from Mississippi who's now 2½ and has been off medication for about a year with no signs of infection. There's no guarantee the child will remain healthy, although sophisticated testing uncovered just traces of the virus' genetic material still lingering.