Today, many parts of the world are concerned about the same thing: swine flu. The World's Lorne Matalon has the latest from the hardest-hit country so far -- Mexico.

Global swine flu outbreak

Anchor Lisa Mullins speaks with epidemiologist Marc Lipsitch about the swine flu -- what it is and what can be done to stop its spread.

The World's Gerry Hadden reports on Spain's first reported case of swine flu and the precautions the government there is taking to reign in the virus.

Global swine flu outbreak

The World's Lorne Matalon has the latest from Mexico City on the swine flu outbreak there. Mexico's capital has essentially closed down, as authorities try to stop the spread of the swine flu virus.

Soldiers handing out masks (photo: Lorne Matalon)

The outbreak of swine flu in Mexico appears to have spread to the southern United States. The U.S. Centers for Disease Control and Prevention has found swine flu cases in California and Texas. Anchor Katy Clark speaks with The World's Health & Science Editor David Baron about what American and international health officials are doing to prepare for a possible flu pandemic.

At least 16 people in Mexico have died from what officials there say is a strain of influenza that originally came from pigs. Meanwhile, swine flu is also being reported in the southern United States. Anchor Katy Clark speaks with The World's Lorne Matalon in Mexico City.

Anchor Lisa Mullins speaks with Chris Maher of the World Health Organization, who is helping coordinate a massive polio vaccination campaign in Kenya and Uganda. Health workers plan to immunize nearly 5 million children tomorrow. The virus had been eradicated from those countries years ago, but it recently reappeared.

Correspondent Karen Weise reports on a new program launched in Panama to vaccinate all ten-year-old girls against HPV -- a sexually transmitted virus that causes cervical cancer. Panamanians have almost universally embraced the vaccinations. But the government isn't saying the virus is spread by sex, and that's raising some ethical concerns.

The Thai-Cambodian border has long been a breeding ground for drug-resistant malaria. The World's Mary Kay Magistad reports on a new campaign to defeat the disease in that region and to keep it from spreading globally.

Lisa Mullins speaks with Stephen Minger, a Senior Lecturer in stem cell biology at King's College, London, about President Obama's lifting of a U.S. ban on stem cell research.

Video: President Obama on stem cell research

2005 series: The Global Race for Stem Cell Therapies