Currently, there is just one official case of bird flu spreading from cows to humans during the US outbreak. However, epidemiologist Gregory Gray believes the actual number is higher based on information he received from workers, farmers, and veterinarians as the virus struck their herds in his state. Gray, an infectious disease epidemiologist at the University of Texas Medical Branch in Galveston, said he knew that some workers sought medical care for influenza-like illness and conjunctivitis while the H5N1 ravaged the dairy farms. He added that he does not have a way to measure that, but it …