Their work could give infected mothers in the developing world a new way to prevent the spread of the AIDS virus to their newborn babies.

VOA: special.2010.05.24

The World Health Organization reports H1N1 has spread to more than 200 countries, with nearly 12,000 laboratory confirmed deaths.

VOA: standard.2009.12.29

"We are working with our partners to stop the spread of nuclear weapons and to seek a world free of nuclear weapons.

VOA: standard.2010.02.06

In Washington, President Barack Obama said the resolution sends an "unmistakable message" about the world's commitment to stopping the spread of nuclear weapons.

VOA: standard.2010.06.09

Dr.Margaret Chan,Director General of the World Health Organization, began a series of daily briefings to track H1N1 as it spread around the globe.

VOA: standard.2009.12.25

Last year at this time, governments around the world intensified efforts to contain a deadly flu virus that killed scores of people in Mexico and quickly spread around the world.

VOA: standard.2010.04.29

We have a big job on our hands,". Borlaug expressed concern about a new variety of wheat stem rust attacking wheat plants in Africa and advocated greater coordination of researchers around the world to stop its spread.

VOA: standard.2009.09.13