Viruses

About half of the Miami Marlins' roster has tested positive for COVID. ESPN baseball analyst Tim Kurkjian explains the challenges Major League Baseball faces as play resumes amid the pandemic.

John Barry, author of the 2004 book, The Great Influenza, draws parallels between today's pandemic and the flu of 1918. In both cases, he says, "the outbreak was trivialized for a long time."

Nathan Wolfe travels to the viral hot spots of the world, where viruses first jump from animals to humans. The scientist spends his days tracking emerging infectious diseases before they turn into global pandemics.

Daszak is the executive director of the Consortium for Conservation Medicine. The program is designed to study the environmental changes brought on by humans and the links between animal, human and ecosystem health. The consortium is interested in finding out how infectious diseases like West Nile virus, malaria and other emerging diseases move between populations, or depend on environmental conditions.

Film critic David Edelstein reviews the new film 28 Days Later. The movie is based on the best-selling novel The Beach, in which animal-rights activists break into a lab and free infected monkeys, letting loose a virus that puts people into a permanent state of murderous rage.