Exclusive reporting reveals how the United States lost track of a virus that could cause the next pandemic.

Laborers have suffered in extreme temperatures triggered by climate change. Deaths aren’t inevitable, researchers say: Employers can save lives by providing ample water and breaks.

Cases have more than doubled in the United States within a few weeks, but researchers can’t determine why the spike is happening because surveillance for human infections has been patchy.

Misinformation coupled with a parental rights movement that shifts decision-making away from public health expertise has contributed to the lowest childhood vaccine rates in a decade.

A new study lends weight to fears that more livestock workers have gotten the bird flu than has been reported.

Farmworkers face some of the most intense exposures to the bird flu virus, but advocates say many of them would lack resources to fall back on if they became ill.

The World Health Organization has issued a report that transforms how the world understands respiratory infections like covid-19, influenza, and measles.

Finland is offering farmworkers bird flu shots. Some experts say the U.S. should too.

The Centers for Disease Control and Prevention says a glitch in its bird flu test hasn’t harmed the agency’s outbreak response. But it has ignited scrutiny of its go-it-alone approach in testing for emerging pathogens.

Why did it take so long to recognize the virus on high-tech farms in the world’s richest country? Because even though H5N1 has circulated for nearly three decades, its arrival in dairy cattle was most unexpected.