Will bird flu become the next pandemic? Disease experts are concerned about surveillance gaps

"It almost seems like a pandemic unfolding in slow motion," said Scott Hensley, a professor of microbiology at the University of Pennsylvania. "Right now, the threat is pretty low ... but that could change in a heartbeat."

Federal surveillance of U.S. dairy cows is limited, with inconsistent state efforts and scarce testing of people exposed to sick cattle, according to government health officials and pandemic flu experts.

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