Drugmaker Pfizer announced last Monday, November 9, about the effectiveness of its vaccine. According to their early studies, the vaccine is 90% effective against the coronavirus. They tested it on 43,538 volunteers and the 94 patients who are positive showed less than 10% infection after taking two shots of the vaccine. This means, it will take 28 days for the vaccine to protect an individual after taking the shots. Two shots are required for this to take effect. The vaccine is currently in its third phase of the test since July 27, and Pfizer aims to reach 164 positive cases with the doses. The company is also testing if the vaccine will have long-term protection even to those who have been infected before. According to Pfizer CEO Albert Bourla, it is still unclear whether the shots are to be distributed yearly or seasonal.