Mayo Clinic - Covid vaccine from Pfizer42% vs Moderna's 76% effective against'Delta' variant.

Mayo Clinic - Covid vaccine from Pfizer 42% vs Moderna's 76% effective against'Delta' variant.

• The two most commonly used COVID-19 vaccines in the U.S. may not be as effective against the Indian 'Delta' variant, a new study finds
• Pfizer's vaccine efficacy dropped to 42% in July, with Moderna's falling down to 76%, when the Delta variant became the dominant strain
• Hospitalizations among vaccinated people remained low despite an increase in cases, though with both vaccines more than 75 percent effective against hospitalization
• The FDA may soon start allowing Americans to receive vaccine booster shots to shore up protection against virus 

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