Courtney Austin 
A new US study has revealed that Pfizer and Moderna vaccines are showing a worrying drop in efficacy against the Covid Delta strain. According to the new data, it now stands at below 50%.
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A new US study has revealed that Pfizer and Moderna vaccines are showing a worrying drop in efficacy against the Covid Delta strain. According to the new data, it now stands at below 50%.
Follow us on Telegram https://t.me/rtintl
