Last week,government scientists in the United States announced the discovery of two antibodies that raise hopes for an AIDS vaccine.

VOA: special.2010.07.14

The tests are the first step in human clinical trials of two vaccine candidates developed at the University of Cape Town.

VOA: special.2009.07.29

For example, the vaccine has been available to a group of Maasai herders in northern Tanzania for about seven years.

VOA: special.2009.11.03

Federal health officials said they expect a vaccine for the H1N1 flu to be available by the middle of October.

VOA: special.2009.08.13

The hope is to develop a vaccine that could give lifelong protection against a majority of flu viruses, including bird flu.

VOA: special.2009.03.04

The vaccine did not lower the amount of virus in the blood of volunteers who became infected during the study.

VOA: special.2009.10.13

In other vaccine news, scientists in Britain say they have found a simple, low-cost way to store vaccines at high temperatures.

VOA: special.2010.02.24

The vaccine has already proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.22

The director of its Vaccine Research Center,Gary Nabel, says each antibody blocks the virus from attaching to white blood cells.

VOA: special.2010.07.14

One was the ability of the vaccine to prevent infections from the human immunodeficiency virus, better known as H.I.V.

VOA: special.2009.10.13

He and another researcher at the Fox Chase Cancer Center in Philadelphia,Irving Millman, invented the vaccine in nineteen sixty-nine.

VOA: special.2011.05.25

But last week, two teams working independently reported a discovery that could help lead to a universal flu vaccine.

VOA: special.2009.03.04

Scientists say an experimental vaccine reduced the risk of infection in human beings by thirty-one percent and was safe.

VOA: special.2009.10.13

But he also said additional research is needed to better understand how the vaccine reduced the risk in those individuals.

VOA: special.2009.10.13