COVID-19 Vaccine Update. How Far Are We From A Covid-19 Vaccine Now ?

#Pfizer says its COVID-19 vaccine is 95% effective. #Moderna says its vaccine is 94.5% effective in preventing Covid-19. COVID-19 वैक्सीन अपडेट | अब हम एक कोविद -19 वैक्सीन से कितने दूर हैं?