PREOCUPANTE:

Last year, rising food prices touched off riots around the world, killing dozens of people. Unable to afford basic supplies, communities in Central Africa are increasingly turning to the forests for food. In doing so, hunters expose themselves to hidden dangers - microscopic pathogens living in the blood of forest animals.

Most of the viruses are harmless, but some are potentially deadly when passed to humans. Scientists point out there's nothing new about these viruses. What is new is the frequency of people's contact with them and how easily they can now be spread around the world.