Immunizations

In this image provided by the McConnell Center at the University of Louisville, Mitch McConnell sits with his parents, Julia "Dean" and A.M. McConnell in this image from the mid 1940's in Five Points, Ala. As the coronavirus pandemic unfolds, Senate Majority Leader Mitch McConnell flashes back to an earlier crisis that gripped the nation, and his own life, when he was a boy. He was struck with polio. (McConnell Center at the University of Louisville via AP)

In this Wednesday, April 8, 2020 photo provided by the Center for Pharmaceutical Research, a participant in a COVID-19 coronavirus vaccine trial receives an injection in Kansas City, Mo. This early safety study, called a Phase 1 trial, is using a vaccine candidate developed by Inovio Pharmaceuticals. (Center for Pharmaceutical Research via AP)

An NYPD traffic officer wearing personal protective equipment directs vehicles at a barricade after the city closed down a section of Bushwick Avenue due to COVID-19 concerns, Friday, March 27, 2020, in the Brooklyn borough of New York. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (AP Photo/John Minchillo)

A women beats a cooking top in Geneva, Switzerland, Friday, March 20, 2020 during the 'Switzerland says thank you' campaign to thank paramedics who fight against the new coronavirus and the COVID-19 disease. For most people, the new coronavirus causes only mild or moderate symptoms. For some it can cause more severe illness. (Martial Trezzini/Keystone via AP)

In this photo released by Saudi Press Agency, SPA, Saudi King Salman, chairs a video call of world leaders from the Group of 20 and other international bodies and organizations, from his office in Riyadh, Saudi Arabia, Thursday, March 26, 2020. The meeting is aimed at coordinating the global response to the fast-spreading coronavirus, which has shuttered businesses and forced well over a quarter of the world's population into home isolation. (Saudi Press Agency via AP)

In this March 19, 2020 photo, a shopper looks for toilet paper at a Stop & Shop supermarket during hours open daily only for seniors in North Providence, R.I. Federal law enforcement is warning that scam artists are preying on older people's fears by peddling fake tests for the coronavirus to Medicare recipients. (AP Photo/David Goldman)

German Chancellor Angela Merkel speaks at a press conference about coronavirus, in Berlin, Sunday, March 22, 2020. German authorities have issued a ban on more than two people meeting outside of their homes, which they believe will be easier to follow than locking people in their homes. The vast majority of people recover from the new coronavirus. According to the World Health Organization, most people recover in about two to six weeks, depending on the severity of the illness. (Michael Kappeler/Pool photo via AP)

FILE - In this Wednesday, March 11, 2020 file photo, a man holds an U.S. flag as he watches the a United Soccer League match in Tacoma, Wash. In a matter of days, millions of Americans have seen their lives upended by measures to curb the spread of the new coronavirus in mid-March. (Joshua Bessex/The News Tribune via AP)