The U.S. may be missing human cases of bird flu, scientists say
Officially, there is only one documented case of bird flu spilling over from cows into humans during the current U.S. outbreak.
But epidemiologist Gregory Gray suspects the true number is higher, based on what he heard from veterinarians, farm owners and the workers themselves as the virus hit their herds in his state.
"We know that some of the workers sought medical care for influenza-like illness and conjunctivitis at the same time the H5N1 was ravaging the dairy farms," says Gray, an infectious disease epidemiologist at the University of Texas Medical Branch in Galveston.
"I don't have a way to measure that, but it seems biologically quite plausible that they too, are suffering from the virus," he says.
Gray has respiratory infections in people who workwith outbreaks bird flu strains that are lethal for poultry like this current one.
