Not only human illegal immigrants are making their way to the United States.
Microbiologists say that tropical birds are carrying a variety of ticks in their migration, and the scientists are afraid some of the ticks will find a home.
The study also points out the need for concern about ticks in Costa Rica because some of the birds begin their flight in Central America. Some fly all the way from Brazil.
A study showed that tick species not normally present in the United States are arriving there on the migratory birds. Some of these ticks carry disease-causing Ricksettia species, and some of those species are exotic to the U.S.
The research was published in Applied and Environmental Microbiology, a journal of the American Society for Microbiology.
Three percent of the birds carried foreign ticks. Based on the total number of migratory birds arriving in the U.S. each spring, in the billions, the investigators estimated that more than 19 million exotic ticks are introduced into the U.S. each spring, said Emily B. Cohen of the Migratory Bird Center, Smithsonian Conservation Biology Institute, National Zoological Park, Washington, D.C.
The ticks carried bacterium that is responsible for lyme disease and