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- WHO recommends masks even for complete vaccines; Pfizer and Moderna vaccines could offer long immunity: COVID-19 updatesUSA TODAY
- With Delta variant more contagious, some officials release new mask guidelinesCNN
- Study suggests Pfizer and Moderna COVID-19 vaccines could provide ‘years’ of protectionYahoo News
- With delta variant peak in Missouri, those who received the J&J vaccine may need a boosterKansas City Star
- US response to Covid-19 faces crazy challenge: vaccinating childrenCNN
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