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

"First off,there is the infectious disease risk because if you use human blood there's a lot of transmissible diseases.

VOA: special.2009.08.03

In two-thousand three, American William Ruddiman first proposed that global warming resulted from human activities thousands of years ago.

VOA: special.2011.04.26

He says identifying human antibodies that will stop the ability of the virus to reinvent itself is the first step.

VOA: special.2009.03.04

Now the two sides were racing to see who could launch the first human space traveler.

VOA: special.2011.05.15

First tests of the bone fragment showed that human genetic material, human DNA,was present.

VOA: special.2011.03.15

But researchers are working to develop the first human vaccine.

VOA: special.2010.07.12

The WHO authorized drug manufacturers to begin testing possible vaccines, and the first human trials began a month later.

VOA: standard.2009.12.25

This was the first meeting of Mr.Obama's full cabinet, after Health and Human Services Secretary Kathleen Sebelius took office on Tuesday.

VOA: standard.2009.05.01

He also awarded the Medal of Freedom to Mary Robinson, Ireland's first female president and a former U.N.high commissioner for human rights.

VOA: standard.2009.08.12

"This is the world's first commercially available pedal generator, allowing to convert your human power into usable electricity.

VOA: standard.2010.02.24

Many consider AIDS 2000 as the first major conference to put a human face on the epidemic.

VOA: standard.2010.05.17

In his first appearance before the UN Human Rights Council representing the United States, U.S.Assistant Secretary of State Michael Posner called the report deeply flawed.

VOA: standard.2009.09.29

Astronaut Neil Armstrong, the first human to step on the Moon, observed the extraordinary accomplishment of the Apollo 11 mission forever established a lasting legacy in space flight.

VOA: standard.2009.07.16

Ensalaco said he hopes the conference is the first of many would help educate the public as well as law enforcement to reach the goal of ending human trafficking.

VOA: standard.2009.11.13