The U.S. Department of Agriculture has announced that it will release hundreds of millions of sterile, fluorescent New World screwworm flies along the Texas–Mexico border to maintain a barrier preventing the parasitic fly from spreading north. The move comes in response to a growing outbreak in Mexico and the serious threat the pest poses to livestock, the agricultural economy, and public health.

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A US federal vaccine advisory committee has announced that it will re-assess all existing vaccination recommendations. Statements from its new chair have triggered strong reactions from the public-health community, which warns that a shift in the committee’s operating philosophy could accelerate declines in vaccination coverage and increase outbreaks of infectious diseases in the United States.

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