Also Read | The march of 2020 in 10 key long reads"Based on our Phase 3 safety and efficacy study, the vaccine provides some protection against COVID-19 within about 10 days of the first dose and substantially boosted after the second dose, supporting the need for a 2-dose vaccination series", it said."Individuals may have contracted disease prior to or right after vaccination", the statement added.Matthew W., 45, a nurse at two different local hospitals, said in a Facebook post on December 18 that he had received the Pfizer vaccine, telling the ABC News affiliate that his arm was sore for a day but that he had suffered no other side-effects.Six days later on Christmas Eve, he became sick after working a shift in the COVID-19 unit, the.