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The workers were likely infected by chickens, which they had been tasked with killing in response to a bird flu outbreak at the farm. The endeavor occurred amid a heat wave, as outside temperatures soared to 104 degrees Fahrenheit. “The barns in which culling occurs were no doubt even hotter,” said CDC principal deputy director Nirav Shah at a July 16 press briefing. Wearing N95 respirators, goggles, and other protective gear was a challenge. Industrial fans whipped feathers around the facility that could have carried the virus, Shah added. In this environment, the farmworkers collected hundreds of chickens by hand and placed them into carts where they could be killed by carbon dioxide gas within two minutes.