An Israeli teacher receives a COVID-19 vaccine at the Assaf Harofeh Medical Center in Tel Aviv, Israel, on Dec. 30, 2020. The total number of vaccines given in Israel since the start of the vaccination campaign on Dec. 20 has surpassed half a million, the state's Ministry of Health said on Wednesday. (Photo by Gil Cohen Magen/Xinhua)

An Israeli medical worker prepares a COVID-19 vaccine at the Assaf Harofeh Medical Center in Tel Aviv, Israel, on Dec. 30, 2020. The total number of vaccines given in Israel since the start of the vaccination campaign on Dec. 20 has surpassed half a million, the state's Ministry of Health said on Wednesday. (Photo by Gil Cohen Magen/Xinhua)

An Israeli teacher receives a COVID-19 vaccine at the Assaf Harofeh Medical Center in Tel Aviv, Israel, on Dec. 30, 2020. The total number of vaccines given in Israel since the start of the vaccination campaign on Dec. 20 has surpassed half a million, the state's Ministry of Health said on Wednesday. (Photo by Gil Cohen Magen/Xinhua)

An Israeli medical worker prepares a COVID-19 vaccine at the Assaf Harofeh Medical Center in Tel Aviv, Israel, on Dec. 30, 2020. The total number of vaccines given in Israel since the start of the vaccination campaign on Dec. 20 has surpassed half a million, the state's Ministry of Health said on Wednesday. (Photo by Gil Cohen Magen/Xinhua)

An Israeli teacher receives a COVID-19 vaccine at the Assaf Harofeh Medical Center in Tel Aviv, Israel, on Dec. 30, 2020. The total number of vaccines given in Israel since the start of the vaccination campaign on Dec. 20 has surpassed half a million, the state's Ministry of Health said on Wednesday. (Photo by Gil Cohen Magen/Xinhua)

An Israeli teacher receives a COVID-19 vaccine at the Assaf Harofeh Medical Center in Tel Aviv, Israel, on Dec. 30, 2020. The total number of vaccines given in Israel since the start of the vaccination campaign on Dec. 20 has surpassed half a million, the state's Ministry of Health said on Wednesday. (Photo by Gil Cohen Magen/Xinhua)