Majaribio ya chanjo na Pfizer na BioNtech kwa ajili ya kupata chanjo dhidi ya COVID-19BioNTech.
Majaribio ya chanjo na Pfizer na BioNtech kwa ajili ya kupata chanjo dhidi ya COVID-19.
Janga la corona au COVID-19 limesababisha athari kubwa katika elimu ya watoto kote duniani na kuwachanja...
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