Pfizer, who is in the final stages of negotiating with India, said on Thursday that its vaccine was very effective compared to Delta's Covid-19 variant, a variant that has emerged as a new threat to the world.
Read More »Pfizer, who is in the final stages of negotiating with India, said on Thursday that its vaccine was very effective compared to Delta's Covid-19 variant, a variant that has emerged as a new threat to the world.
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