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1 https://www.ema.europa.eu/en/human-regulatory/overview/public-health-wealth-threats/coronavirus-disease-covid--19/pransements-vaccines-vaccines/vaccines/covid-19-vaccines 2 https://www.fda.gov/emgercency-preparedness-and-prepens---response/coronavirus-disease-2019-covid-19/covid-19-vaccines 3 https:///www.aljazeera.com/news/news/news/news/news/news/2021/2021/7/7/7/19/-------------------------------------------------------------------不同的研究）4 https://www.nature.com/articles/d41586-021-01359-3 5 https://apps.who.int/iris/bitsream/bitstream/handle/10665/10665/341786/ bnt162b2-2021.2-eng.pdf？sequence = 1＆isalloed = y 6 https://www.fhi.no.no/en/en/news/2021/2021/vaccines-from-biontech-biontech-biontech--pfizer-pfizer-moderna-can-moderna-can-can-be-can-be-can-be-can-be-can-be-combine/-7，7 https://www.reuters.com/business/healthcare-pharmaceuticals/who-warns-against-mixing-matching-covid-vaccines- 2021-07-12/ 8 https://www.cdc.gov/vaccines/covid-19/clinical-considerations/covid-19-vaccines- US.html＃：〜：text =互换％20of％20covid％2D19％20Vaccine％20Products，-y any％20crusty％20fda＆text =但是％2C％20COVID％20COVID％2D19％20Vaccine％20Vaccine％20PRoducts％20 rare; ble。＆text = data％20on％20 the％20SAFETY％20和完成％20 with％20 the％20SAME％20Product。
海员对COVID-19的疫苗接种。
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