Roll-out of vaccination against COVID-19 pandemic

Main text Vaccination is a crucial countermove against infectious diseases by two main mechanisms: (1) prevent infection; (2) reduce infectivity and severity and duration of symptoms of vaccinated patients. Since the outbreak of COVID-19, several vaccines have been developed and proved effective. Vaccine efficacy has also been confirmed by real world data, with 40% lower viral RNA load, 58% lower febrile symptom and 2.3 fewer days of illness duration for vaccinated cases [3]. [...]during the recent outbreak in Guangzhou, the vaccine efficacy was 69% against infection and 95% against severe symptoms. [...]evidence from randomized controlled trials and real world studies verified the effectiveness of COVID-19 vaccines.