vaccine effectiveness
The Latest
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Pfizer And Moderna Vaccines May Have Different Level Of Protection -- Studies
The two vaccines have a high difference in terms of long-term effectiveness. 
The two vaccines have a high difference in terms of long-term effectiveness. -
CDC Studies Show COVID-19 Vaccine Efficacy Declining As Delta Variant Spreads Across U.S.
Protection offered by two doses of the Oxford/AstraZeneca and Pfizer/BioNTech vaccines starts to decrease within six months. 
Protection offered by two doses of the Oxford/AstraZeneca and Pfizer/BioNTech vaccines starts to decrease within six months.
