vaccine for prevention of covid-19 is
(1)covishield
(2)covaccine
(3)sputnic
(4)All of the above
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Answer:
all of these is answer
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Clinical trials of mRNA vaccines have consistently demonstrated high effectiveness against COVID-19, but now a large, real-world study confirms that the Pfizer-BioNTech and Moderna vaccines are more than 95% effective in preventing confirmed infection.
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