A Syrian doctor gives seasonal flu vaccine to a medical worker at a hosptial in Damascus, capital of Syria, on Oct. 21, 2020. The Health Ministry carried out a campaign to protect its workers from a possible second wave of COVID-19. Vaccinating seasonal influenza is necessary in order to avoid overlapping infections in winter. (Photos: Ammar Safarjalani/Xinhua)

Syrian doctors check new protective overalls to protect against COVID-19 at a hospital in the capital Damascus on Oct. 21, 2020. The Health Ministry carried out a campaign to protect its workers from a possible second wave of COVID-19. Vaccinating seasonal influenza is necessary in order to avoid overlapping infections in winter.

A Syrian doctor gives seasonal flu vaccine to a medical worker at a hosptial in Damascus, capital of Syria, on Oct. 21, 2020. The Health Ministry carried out a campaign to protect its workers from a possible second wave of COVID-19. Vaccinating seasonal influenza is necessary in order to avoid overlapping infections in winter.