The first complete study of the circulation of 18 pathogens, done by Catalan researchers, shows that immunization against coronavirus is done after the epidemic waves and not before, as should be
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The first complete study of the circulation of 18 pathogens, done by Catalan researchers, shows that immunization against coronavirus is done after the epidemic waves and not before, as should be

The first complete study of the circulation of 18 pathogens, done by Catalan researchers, shows that immunization against coronavirus is done after the epidemic waves and not before, as should be