Covid-19: Only the second dose of the vaccine ensures significant protection among the elderly

Instituto Gulbenbenkian de Ciência, in partnership with Almeirim Municipality and the Group of Lezíria Health Centers, carried out a study in the elderly living in nursing homes, vaccinated with the Pfizer vaccine. The study measured antibodies against SARS-CoV- 2 before the vaccination, three to four weeks after the first dose and 3 weeks after the second dose. The results reveal that only 25% develop antibodies after the first dose, values ​​that reach 95% after the second dose. 5% of participants do not develop immunity after taking the vaccine. 

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