A man reacts by shedding a tear, after a health worker took a swab during mass testing in an effort to stop the spread of the coronavirus disease (COVID-19), in Nairobi, Kenya May 28, 2020. REUTERS/Baz Ratner

A child reacts as a health worker takes a swab during mass testing in an effort to stop the spread of the coronavirus disease (COVID-19), in Nairobi Kenya May 28, 2020. REUTERS/Baz Ratner

A health worker takes a swab from a woman during mass testing in an effort to stop the spread of the coronavirus disease (COVID-19), in Nairobi, Kenya May 28, 2020. REUTERS/Baz Ratner

A man reacts as a health worker takes a swab during mass testing in an effort to stop the spread of the coronavirus disease (COVID-19), in Nairobi, Kenya May 28, 2020. REUTERS/Baz Ratner

A health worker takes a swab from a woman during mass testing in an effort to stop the spread of the coronavirus disease (COVID-19), in Nairobi, Kenya May 28, 2020. REUTERS/Baz Ratner

A health worker takes the temperature of a man standing in line for mass testing in an effort to stop the spread of the coronavirus disease (COVID-19), in Nairobi, Kenya May 28, 2020. REUTERS/Baz Ratner

A health worker takes the temperature of a girl standing in line for mass testing in an effort to stop the spread of the coronavirus disease (COVID-19) in Nairobi, Kenya May 28, 2020. REUTERS/Baz Ratner

A health worker cuts a swab into a tube during mass testing in an effort to stop the spread of the coronavirus disease (COVID-19), in Nairobi, Kenya May 28, 2020. REUTERS/Baz Ratner

Protesters attend a woman who allegedly stabbed looters before stabbing herself in an effort to stop the looting, near the Minneapolis Police third precinct, where demonstrators gathered after a white police officer was caught on a bystander's video pressing his knee into the neck of African-American man George Floyd, who later died at a hospital, in Minneapolis, Minnesota, U.S. May 27, 2020. REUTERS/Nicholas Pfosi

Protesters attend a woman who allegedly stabbed looters before stabbing herself in an effort to stop the looting, near the Minneapolis Police third precinct, where demonstrators gathered after a white police officer was caught on a bystander's video pressing his knee into the neck of African-American man George Floyd, who later died at a hospital, in Minneapolis, Minnesota, U.S. May 27, 2020. REUTERS/Nicholas Pfosi TPX IMAGES OF THE DAY

Indonesian airforce personnel take part in a large scale effort to enforce social restrictions amid the coronavirus disease (COVID-19) outbreak, at a train station in Jakarta, Indonesia, May 28, 2020. REUTERS/WIlly Kurniawan

A health worker takes a swab from a child during a mass testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner

A health worker takes a swab from a child during a mass testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner

A health worker takes a swab from a woman during a mass testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner TPX IMAGES OF THE DAY

A health worker sprays disinfectants at a school before it is used for mass testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner

Health workers spray disinfectant at a school before it is used for mass testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner

A man reacts as a health worker takes a swab during a mass testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner

Health workers adjust protective gear as they prepare to perform mass testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner

A man stands in a social distance marker as he waits during a mass testing, in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner

A man reacts as a health worker takes a swab during a mass testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner

A health worker takes the temperature of a person standing in line for mass testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner

A health worker tests a woman for the coronavirus during a mass testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner

A health worker dresses in a protective suit before starting to perform the coronavirus testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner

People stand in line for mass testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. REUTERS/Baz Ratner

A sign reading "Play Like A Champion Today" is seen inside a laboratory at Sorrento Therapeutics, where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Laboratory equipment is seen at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

A scientist holds up sample vials inside a laboratory at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

An Attune NxT Flow Cytometer is seen inside a laboratory at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

A scientist loads samples into a laboratory freezer at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Sample vials are seen inside a laboratory at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Pipettes and sample vials are seen inside a laboratory at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Associate director Dr. Hua Wang works in a laboratory at Sorrento Therapeutics, where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Research associate Kenneth Roy Rienecker III works in a laboratory at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Sorrento Therapeutics CEO Dr. Henry Ji takes a phone call inside one of Sorrento?s laboratories, where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Senior scientist Dr. Cherry Cao removes samples from a freezer at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Senior scientist Dr. Weixin Shen works at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

A scientist uses a pipette while working at Sorrento Therapeutics, where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Research associate Sachi Johnson works at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

A laboratory bench covered in equipment is seen at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Lab equipment and sample vials are seen at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Sample vials are seen inside a laboratory at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Research associate Sachi Johnson works at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan TPX IMAGES OF THE DAY

Sample vials are seen inside a laboratory refrigerator at Sorrento Therapeutics, where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Senior scientist Dr. Ying Wang works at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Research associate Sachi Johnson works at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

Pipettes are seen in a laboratory at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Bing Guan

A Lab technician works at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Mike Blake

A Lab technician works at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Mike Blake

A Lab technician works at Sorrento Therapeutics where efforts are underway to develop an antibody, STI-1499, to help in prevention of the coronavirus disease (COVID-19) in San Diego, California, U.S., May 22, 2020. REUTERS/Mike Blake

A man uses chalk to create a social distancing marker before a free water distribution in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slums of Nairobi, Kenya, May 22, 2020. REUTERS/Baz Ratner

A health worker sprays disinfectants in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slums of Nairobi, Kenya, May 22, 2020. REUTERS/Baz Ratner

A man uses chalk to create a social distancing marker before a free water distribution in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slums of Nairobi, Kenya, May 22, 2020. REUTERS/Baz Ratner

A man uses chalk to create a social distancing marker before a free water distribution in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slums of Nairobi, Kenya, May 22, 2020. REUTERS/Baz Ratner

A boy stands in a social distancing marker before a free water distribution in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slums of Nairobi, Kenya, May 22, 2020. REUTERS/Baz Ratner

A health worker sprays disinfectants in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slums of Nairobi, Kenya, May 22, 2020. REUTERS/Baz Ratner

A health worker sprays disinfectants in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slums of Nairobi, Kenya, May 22, 2020. REUTERS/Baz Ratner

A health worker sprays disinfectants in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slums of Nairobi, Kenya, May 22, 2020. REUTERS/Baz Ratner

A girl stands in a social distancing marker before a free water distribution in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slums of Nairobi, Kenya, May 22, 2020. REUTERS/Baz Ratner

A mural, dedicated to the outbreak of the coronavirus disease (COVID-19), depicting characters making efforts to keep the virus at bay painted by Thai street artist Mue Bon is seen in Bangkok Thailand, May 21, 2020. Picture taken May 21, 2020. REUTERS/Juarawee Kittisilpa

National Guard personnel wear protective masks at the Washington State Department of Health, which has trained the National Guard personnel to support case investigation and contact tracing in the state, as efforts continue to help slow the spread of the coronavirus disease (COVID-19) in Tumwater, Washington, U.S. May 20, 2020. REUTERS/Jason Redmond