A soldier receives a dose of China's Sinovac COVID-19 vaccine at the Marikina Sports Center in Marikina City, the Philippines, March 2, 2021. The Philippines has begun their COVID-19 vaccination campaign after the country received the shipment of the Sinovac vaccine CoronaVac from China. (Xinhua/Rouelle Umali)

A nurse prepares a dose of China's Sinovac COVID-19 vaccine at the Marikina Sports Center in Marikina City, the Philippines, March 2, 2021. The Philippines has begun their COVID-19 vaccination campaign after the country received the shipment of the Sinovac vaccine CoronaVac from China. (Xinhua/Rouelle Umali)

A healthcare worker receives a dose of China's Sinovac COVID-19 vaccine at the Marikina Sports Center in Marikina City, the Philippines, March 2, 2021. The Philippines has begun their COVID-19 vaccination campaign after the country received the shipment of the Sinovac vaccine CoronaVac from China. (Xinhua/Rouelle Umali)

A nurse prepares a dose of China's Sinovac COVID-19 vaccine at the Marikina Sports Center in Marikina City, the Philippines, March 2, 2021. The Philippines has begun their COVID-19 vaccination campaign after the country received the shipment of the Sinovac vaccine CoronaVac from China. (Xinhua/Rouelle Umali)

Photo taken on March 2, 2021 shows people receiving China's Sinovac COVID-19 vaccines at the Marikina Sports Center in Marikina City, the Philippines. The Philippines has begun their COVID-19 vaccination campaign after the country received the shipment of the Sinovac vaccine CoronaVac from China. (Xinhua/Rouelle Umali)

A nurse prepares a dose of China's Sinovac COVID-19 vaccine at the Marikina Sports Center in Marikina City, the Philippines, March 2, 2021. The Philippines has begun their COVID-19 vaccination campaign after the country received the shipment of the Sinovac vaccine CoronaVac from China. (Xinhua/Rouelle Umali)

A nurse prepares a dose of China's Sinovac COVID-19 vaccine at the Marikina Sports Center in Marikina City, the Philippines, March 2, 2021. The Philippines has begun their COVID-19 vaccination campaign after the country received the shipment of the Sinovac vaccine CoronaVac from China. (Xinhua/Rouelle Umali)

A healthcare worker receives a dose of China's Sinovac COVID-19 vaccine at the Marikina Sports Center in Marikina City, the Philippines, March 2, 2021. The Philippines has begun their COVID-19 vaccination campaign after the country received the shipment of the Sinovac vaccine CoronaVac from China. (Xinhua/Rouelle Umali)

A nurse prepares a dose of China's Sinovac COVID-19 vaccine at the Marikina Sports Center in Marikina City, the Philippines, March 2, 2021. The Philippines has begun their COVID-19 vaccination campaign after the country received the shipment of the Sinovac vaccine CoronaVac from China. (Xinhua/Rouelle Umali)

A healthcare worker receives a dose of China's Sinovac COVID-19 vaccine at the Marikina Sports Center in Marikina City, the Philippines, March 2, 2021. The Philippines has begun their COVID-19 vaccination campaign after the country received the shipment of the Sinovac vaccine CoronaVac from China. (Xinhua/Rouelle Umali)

A nurse prepares China's Sinovac COVID-19 vaccines at the Marikina Sports Center in Marikina City, the Philippines, March 2, 2021. The Philippines has begun their COVID-19 vaccination campaign after the country received the shipment of the Sinovac vaccine CoronaVac from China. (Xinhua/Rouelle Umali)

Healthcare workers, policemen, soldiers and other COVID-19 frontliners line up for vaccination at the Marikina Sports Center in Marikina City, the Philippines, March 2, 2021. The Philippines has begun their COVID-19 vaccination campaign after the country received the shipment of the Sinovac vaccine CoronaVac from China. (Xinhua/Rouelle Umali)