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How will the different formulations of the COVID-19 vaccine (Pfizer, Morderna, Oxford..etc) work if there are different strains of COVID-19 globally? How will this all play out when tourism begins to pick up where different strains and vaccines are floating around?

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How will the different formulations of the COVID-19 vaccine (Pfizer, Morderna, Oxford..etc) work if there are different strains of COVID-19 globally? How will this all play out when tourism begins to pick up where different strains and vaccines are floating around?	1