Some churches at the center of COVID-19 outbreaks have shunned attention or responded with defiance, while others have limited crowd sizes and encouraged congregants to wear masks and practice social distancing. Alex Edelman/AFP via Getty Images hide caption
Pictured in 2019, Okinawa Governor Denny Tamaki on Tuesday questioned U.S. measures to stop the coronavirus from spreading on the island. Behrouz Mehri/AFP via Getty Images hide caption
The Canterbury Rehabilitation & Healthcare Center is a hot spot for the coronavirus in Richmond, Va. It's one of 56 facilities with an outbreak. Steve Helber/AP hide caption
Three U.S. airports will screen passengers from Wuhan, China, for coronavirus symptoms: Los Angeles International Airport (pictured above), JFK in New York and SFO in San Francisco. FG/Bauer-Griffin/GC Images hide caption
MMR — the modern combination vaccine against measles, mumps and rubella — provides stronger, longer-lasting protection against measles than the stand-alone measles vaccine typically given in the U.S. in the early 1960s. Eric Risberg/AP hide caption
A man shops for vegetables near romaine lettuce for sale at a supermarket in California, where the first death from the E. coli outbreak was reported. Frederic J. Brown/AFP/Getty Images hide caption
This bacterium is the cause of the mystery illness in Liberia. We don't want to give it away ... so you'll have to read the story to find out what it is. BSIP/UIG/Getty Images hide caption
A measles vaccine, such as the one shown here from a Los Angeles clinic, is highly effective in preventing the spread of measles. Lucy Nicholson/Reuters hide caption
Scientists say low chlorine levels in Flint's water system during the city's water crisis in 2014 and 2015 led the bacterium Legionella pneumophila to proliferate, causing a deadly outbreak of Legionnaire's disease. Science Source hide caption
Workers spray to kill fleas in a public school in Antananarivo, Madagascar's capital. A bite from an infected flea can spread the plague, which has stricken 157 people in the island nation since August. Anadolu Agency/Getty Images hide caption
A farm in Iowa plans to slaughter more than five million chickens in response to an outbreak of bird flu. Charlie Neibergall/AP hide caption
Kenyan health officials take the temperatures of passengers arriving at the Nairobi airport on Thursday. Kenya has no reported cases of Ebola, but it's a transportation hub and so is on alert. Simon Maina/AFP/Getty Images hide caption