Coronavirus vaccine still 80-88% effective among chronic disease carriers
Researchers also saw that the vaccine was 92% effective in preventing symptomatic infections in people over 70.
A medical worker holds a syringe with Sputnik V (Gam-COVID-Vac) vaccine against the coronavirus disease (COVID-19) before administering an injection at a vaccination centre in a shopping mall in Saint Petersburg, Russia February 24, 2021.Updated: 
