A soldier of Uganda People's Defense Forces (UPDF) receives a dose of AstraZeneca COVID-19 vaccine at UPDF Senior Officers Diagnostic Centre in Mbuya in Kampala, Uganda, March 18, 2021. Uganda on March 10 launched the first phase of COVID-19 vaccination campaign targeting high risk groups in the country. (Photo by Hajarah Nalwadda/Xinhua)

A dose of AstraZeneca COVID-19 vaccine is seen in a vaccine carrier at Uganda People's Defense Forces (UPDF) Senior Officers Diagnostic Centre in Mbuya in Kampala, Uganda, March 18, 2021. Uganda on March 10 launched the first phase of COVID-19 vaccination campaign targeting high risk groups in the country. (Photo by Hajarah Nalwadda/Xinhua)

A health worker of Uganda People's Defense Forces (UPDF) administers a dose of COVID-19 vaccine during the vaccination for security personnel at UPDF Senior Officers Diagnostic Centre in Mbuya in Kampala, Uganda, March 18, 2021. Uganda on March 10 launched the first phase of COVID-19 vaccination campaign targeting high risk groups in the country. (Photo by Hajarah Nalwadda/Xinhua)

A health worker of Uganda People's Defense Forces (UPDF) prepares a dose of COVID-19 vaccine during the vaccination for security personnel at UPDF Senior Officers Diagnostic Centre in Mbuya in Kampala, Uganda, March 18, 2021. Uganda on March 10 launched the first phase of COVID-19 vaccination campaign targeting high risk groups in the country. (Photo by Hajarah Nalwadda/Xinhua)

Soldiers of Uganda People's Defense Forces (UPDF) sign their consent forms before receiving AstraZeneca COVID-19 vaccine at UPDF Senior Officers Diagnostic Centre in Mbuya in Kampala, Uganda, March 18, 2021. Uganda on March 10 launched the first phase of COVID-19 vaccination campaign targeting high risk groups in the country. (Photo by Hajarah Nalwadda/Xinhua)