The first case of a human with a screwworm infection has become a cause for concern for many in the United States. How much ...

The United States eradicated New World screwworms, a blue-grey blowfly, in the 1960s. These parasites can cause infestations in warm-blooded animals, and, rarely, humans, which can be extremely ...

The patient had recently returned to Maryland after traveling to El Salvador. The risk to public health in the US is very low ...