Bird Flu Is Picking its Way Across the Animal Kingdom—and Climate Change Could Be Making it Worse

A person in Texas recently tested positive for avian influenza. The virus has already spilled over into a number of mammalian species since it first appeared.

On Monday, Texas health officials confirmed an individual who had “direct exposure to dairy cattle” has contracted bird flu, marking the second reported human case of the H5N1 virus in U.S. history.