חיסון פייזר לקורונה: מה חדש?

Less than 0.001% of fully vaccinated Americans died after a Covid-19 breakthrough case, CDC data shows https://edition.cnn.com/2021/07/31/health/fully-vaccinated-people-breakthrough-hospitalization-death/index.html Pfizer data suggest third dose of Covid-19 vaccine 'strongly' boosts protection against Delta variant https://edition.cnn.com/2021/07/28/health/pfizer-third-dose-data-bn/index.html