The study of pig
farm workers and residents in Wisconsin found that 17 of 74
had antibodies to swine flu viruses in their blood, indicating
they'd been infected. In contrast, only 1 of 114 blood samples
taken from the general population harbored such antibodies.
What do these
The species barrier
between people and pigs may be easier for a virus to cross
than previously thought. Also, a pig respiratory tract is
receptive to both human and bird flu viruses, making the animal
a potential breeding ground in which a mutant virus could
evolve and possibly be transmitted to people.
It's unclear whether
infection with a swine flu virus could produce an illness
any different from the everyday flu.
Infectious Diseases 2002;8:814-819