International
Pfizer, AstraZeneca Effective Against Variants, Study Finds
Both vaccines fend off death, serious illness from two variants after two shots
Study Reveals Pfizer-BioNTech Vaccine Less Effective Against South African Variant
International
Pfizer-BioNTech Vaccine Safe, Effective in Youth 12-15, Companies Say
Pfizer says it will soon seek emergency authorization from US Food and Drug Administration to inoculate children starting at age 12
International
Pfizer-BioNTech Vaccine Neutralizes Brazil Variant of COVID-19, Study Finds
Researchers find vaccine roughly as effective against Brazilian variant as it was against other, less contagious versions of virus
International
Pfizer-BioNTech Vaccine Effective at Standard Freezer Temperatures
Study shows coronavirus vaccine works for two weeks at -25°C to -15°C
International
Study Reveals Pfizer-BioNTech Vaccine Less Effective Against South African Variant
Moderna reveals similar results of its two-dose vaccine against B.1.35.1 variant ///
VOA News
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International
AstraZeneca Vaccine Less Effective Versus South African Variant
Limited early trial shows protection limited against mild disease
International
Russia's Sputnik Vaccine Safe, Effective Against COVID-19, Study Finds
Researchers say that, based on their trial, which involved about 20,000 people in Russia last fall, the vaccine is about 91 percent effective in preve