LONDON :A single dose of Pfizer's coronavirus vaccine may not generate a sufficient immune response to protect against dominant new variants, except in people who have already been infected with COVID-19, according to a UK study published on Friday.
The Imperial College-led study, which looked at immune responses among healthcare workers in Britain after their first dose of the Pfizer shot, found that those who had previously had mild or asymptomatic infection had enhanced protection against more infectious mutated variants that emerged in Britain and South Africa.
"People who have had their first dose of vaccine and who have not previously been infected with SARS-CoV-2 are not fully protected against the circulating 'variants of concern'."
3rd and 4th doses coming your way. Then 5th and 6th......... WHILE VIRYS MUTATES
所以那些還沒有完成接種第二針疫苗的國家是不能對印度，巴基斯坦，尼泊爾，斯里蘭卡開放的。
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