The research, led by the University of Plymouth and published in The Lancet, has shown that antidepressant mirtazapine offered no improvement in agitation for people with dementia - and was possibly more likely to be associated with mortality than no intervention at all.

The findings, published Oct. 11 in the journal Nature, also show at those infected with the virus prior to vaccination exhibit a more robust immune response to all variants than those who were uninfected and fully vaccinated.

The study, published in the New England Journal of Medicine, found that health care personnel who received a two-dose regimen of Pfizer-BioNTech vaccine had an 89% lower risk for symptomatic illness than those who were unvaccinated.