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Because this study was limited to databases of publicly available genomes and a comparatively small set of local samples, the possibility of collection bias cannot be ruled out. polo ralph lauren full zip sweater Agreements have already been established, or are in the works, to procure millions of doses from Pfizer, AstraZeneca, Johnson & Johnson, Serum Institute of India and Sanofi. polo ralph lauren full zip sweater GET THE FOX NEWS APPThe shot differs from Pfizer and BioNTech’s and Moderna’s, which were developed using mRNA technology, as this was derived from an adenovirus vector formula. polo ralph lauren full zip sweater Researchers investigated the effectiveness of the vaccine given the resurgence of cases driven by a more transmissible and likely more virulent variant called B.1.351. polo ralph lauren full zip sweater