People receive COVID-19 tests at the Croatian Institute of Public Health in Zagreb, Croatia, Dec. 12, 2020. (Igor Kralj/Pixsell via Xinhua)
A health worker takes a sample from a person for COVID-19 test at a drive-in testing spot in Zagreb, Croatia, Dec. 12, 2020. (Zeljko Lukunic/Pixsell via Xinhua)
A health worker takes a sample from a person for COVID-19 test at a drive-in testing spot in Zagreb, Croatia, Dec. 12, 2020. (Zeljko Lukunic/Pixsell via Xinhua)
People wait in cars for COVID-19 tests at a drive-in testing spot of the Croatian Institute of Public Health in Zagreb, Croatia, Dec. 12, 2020. (Igor Kralj/Pixsell via Xinhua)