(CNN) Under real world conditions, the Pfizer and Moderna Covid-19 vaccines provide highly effective protection, according to a new report from the US Centers for Disease Control and Prevention. At full vaccination, the vaccines were 90% effective at preventing infections, including infections that had no symptoms. The CDC said it is the first of many planned Covid-19 vaccine effectiveness studies. The volunteers in the study worked in eight locations around the country and had been observed from mid-December to mid-March. Most of the volunteers, more than 62%, had received both doses of either a Pfizer or Moderna Covid-19 vaccine.

Source: CNN March 29, 2021 20:48 UTC