Researchers and legislators are trying to determine just how far some obscure but deadly third world diseases have penetrated into the United States.
Studies in recent years have shown that diseases typically confined to less-developed countries have entered the United States, coming over the border or arising in places where conditions abruptly changed, like post-Katrina Louisiana. But poverty and a lack of access to healthcare have made it hard to determine how severe the problem might be.
Full story: Asthma Worm: 3rd World Diseases to U.S.?