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Continue to ChatBrechlyn deufalent Pfizer mRNA wedi gymeradwyo ar gyfer ymgyrch atgyfnerthu Covid-19 https://www.carmarthenshirenewsonline.com/news/brechlyn-deufalent-pfizer-mrna-wedi-gymeradwyo-ar-gyfer-ymgyrch-atgyfnerthu-covid-19/