SARS-CoV-2 risk is lower among children aged younger than 5 who had vs did not have prior infection, regardless of vaccination status.

The following is a summary of “Impact of disease severity, age, sex, comorbidity, and vaccination on secondary attack rates of SARS-CoV-2: a global systematic review and meta-analysis,” published in ...

A new study from researchers at Weill Cornell Medicine-Qatar (WCM-Q) reveals how the SARS-CoV-2 virus evolved from initially ...

Findings indicate a sharp drop in immunity after Omicron infection, stressing the necessity for updated vaccines to enhance protection against reinfection.

A Weill Cornell Medicine-Qatar study found that SARS-CoV-2 evolved from prioritizing transmission to evading immunity after the Omicron variant emerged. Before Omicron, natural immunity from prior ...

The study explores the potential of chitosan derivatives as novel inhibitors against the wild-type and emerging variants of ...

Infection with the SARS-CoV-2 Omicron variant confers weak, short-term protection against reinfection, compared with the much more robust and durable protection provided by earlier variants, which ...

In total, 5% of dogs and 13% of cats tested positive for COVID-19 on polymerase chain reaction, and 25% and 36%, respectively ...

Multiple vaccine shots are needed to boost vasculitis patients’ immunity against COVID, especially if they have been treated ...

Objective Delayed second dose SARS-CoV-2 vaccination trades maximal effectiveness for a lower level of immunity across more of the population. We investigated whether patients with inflammatory bowel ...