Staff members transport a cargo containing the Sinovac COVID-19 vaccines in Manila, the Philippines, June 17, 2021. China sustained the COVID-19 vaccines supply to the Philippines with the delivery of an additional batch of Sinovac CoronaVac on Thursday. [Photo by Rouelle Umali/Xinhua]

Staff members transport a cargo containing the Sinovac COVID-19 vaccines in Manila, the Philippines, June 17, 2021. China sustained the COVID-19 vaccines supply to the Philippines with the delivery of an additional batch of Sinovac CoronaVac on Thursday. [Photo by Rouelle Umali/Xinhua]

A staff member checks the cargos containing the Sinovac COVID-19 vaccines in Manila, the Philippines, June 17, 2021. China sustained the COVID-19 vaccines supply to the Philippines with the delivery of an additional batch of Sinovac CoronaVac on Thursday. [Photo by Rouelle Umali/Xinhua]

A staff member's hand is seen during the transportation of a cargo containing the Sinovac COVID-19 vaccines in Manila, the Philippines, June 17, 2021. China sustained the COVID-19 vaccines supply to the Philippines with the delivery of an additional batch of Sinovac CoronaVac on Thursday. [Photo by Rouelle Umali/Xinhua]

Staff members transport a cargo containing the Sinovac COVID-19 vaccines in Manila, the Philippines, June 17, 2021. China sustained the COVID-19 vaccines supply to the Philippines with the delivery of an additional batch of Sinovac CoronaVac on Thursday. [Photo by Rouelle Umali/Xinhua]

A staff member disinfects the cargos containing the Sinovac COVID-19 vaccines in Manila, the Philippines, June 17, 2021. China sustained the COVID-19 vaccines supply to the Philippines with the delivery of an additional batch of Sinovac CoronaVac on Thursday. [Photo by Rouelle Umali/Xinhua]

A staff member checks the cargos containing the Sinovac COVID-19 vaccines in Manila, the Philippines, June 17, 2021. China sustained the COVID-19 vaccines supply to the Philippines with the delivery of an additional batch of Sinovac CoronaVac on Thursday. [Photo by Rouelle Umali/Xinhua]

Staff members transport a cargo containing the Sinovac COVID-19 vaccines in Manila, the Philippines, June 17, 2021. China sustained the COVID-19 vaccines supply to the Philippines with the delivery of an additional batch of Sinovac CoronaVac on Thursday. [Photo by Rouelle Umali/Xinhua]

A cargo containing the Sinovac COVID-19 vaccines is seen upon arrival in Manila, the Philippines, June 17, 2021. China sustained the COVID-19 vaccines supply to the Philippines with the delivery of an additional batch of Sinovac CoronaVac on Thursday. [Photo by Rouelle Umali/Xinhua]

A staff member transports a cargo containing the Sinovac COVID-19 vaccines in Manila, the Philippines, June 17, 2021. China sustained the COVID-19 vaccines supply to the Philippines with the delivery of an additional batch of Sinovac CoronaVac on Thursday. [Photo by Rouelle Umali/Xinhua]