A very recently published study in the journal, Emerging Microbes and Infection, undertook a mouse model of Covid infection to investigate age-associated breakthrough Covid infections, that is, Covid infections in vaccinated mice. It was found that he immune systems of the aged mice were significantly impaired compared to that of younger mice, and the aged mice were more susceptible to re-infection, also due to decreased immune function. It is hypothesised that the same result may be replicated in human populations.
“Emerg Microbes Infect
