https://www.clinicalmicrobiologyandinfection.com/article/S1198-743X%2821%2900367-0/fulltext#%20

https://www.byoblu.com/2021/09/17/vaccinati-con-patologie-pregresse-si-ammalano-in-forma-grave-di-covid-e-muoiono-studio-israeliano-sfata-lultimo-mito-sui-vaccini-covid/