UK researchers say efficacy of Pfizer, AstraZeneca weakens in 90 days but both ‘still doing really well’ against strain.
Read More Source: AL Jazeera English
COVID vaccine efficacy wanes, but jabs offer protection: Study
UK researchers say efficacy of Pfizer, AstraZeneca weakens in 90 days but both ‘still doing really well’ against strain.
Read More Source: AL Jazeera English