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Sarah King isn't afraid of having the flu — in fact, she considers herself an "excellent sick person."

"I have a pretty high pain tolerance," King says. "I'm not a person that whines a lot. I just kind of suck it up."

So when she heard about a medical study that pays volunteers about $3,000 to be infected with the live flu virus, King thought the offer sounded too good to pass up. Last fall, she checked in for a 10-day stay at Saint Louis University's "Hotel Influenza," a quarantine unit where researchers study how the human immune system fights the flu.

After decades of progress against one of the most contagious human viruses, the world is seeing measles stage a slow, steady comeback.

The World Health Organization and the CDC say in a new report that there were nearly 10 million cases of measles last year, with outbreaks on every continent.

An estimated 140,000 people died from measles in 2018, WHO says, up from an all-time low of 90,000 in 2016.

And so far 2019 has been even worse.

Centers for Disease Control and Prevention graphic about measles.
Centers for Disease Control and Prevention

The Centers for Disease Control and Prevention has reported more than 900 cases of measles in the United States this year, including two in Florida. Meanwhile the number of cases of Hepatitis A in the state continues to rise.

Centers for Disease Control and Prevention graphic about measles.
Centers for Disease Control and Prevention

A new study finds four counties in Florida are some of the most vulnerable areas for a measles outbreak in the nation.


Centers for Disease Control and Prevention graphic about measles.
Centers for Disease Control and Prevention

Health officials in Pinellas County are investigating a measles case in a 72-year-old man. This comes amid a national uptick in measles outbreaks.


Florida lags behind the rest of the country in vaccinating children for the human papillomavirus

Part of the problem started eight years ago, when the HPV vaccine was introduced as a way to prevent a sexually transmitted infection that researchers knew was a major cause of cervical cancer and other disease.