Mike Stobbe

Two unvaccinated people have died of measles in Pennsylvania, marking the first US deaths this year as the country grapples with the largest outbreak of the disease in three decades.

Cyclospora cases have been reported in at least 47 states this year, and investigators have continued to probe how many could be linked to a common contaminated source.

State officials said Monday an outbreak of cyclosporiasis that has sickened more than 2,600 Michigan residents is believed to have originated with infected lettuce or salad greens.

Michigan is experiencing its largest outbreak of a parasitic infection that causes severe diarrhea.

A study on COVID-19 vaccine effectiveness has finally been published after being blocked from a government health journal.

In the mid-1960s, 42% of U.S. adults were smokers. The rate has been gradually dropping for decades, due to cigarette taxes, tobacco product price hikes, smoking bans, public education campaigns...