By Lisa Marshall
People who think they have COVID-19 should wait two days after respiratory symptoms develop before they test, but those who might have influenza or respiratory syncytial virus (RSV) would be better off testing right away, according to a new study from researchers at the University of Colorado at Boulder (Sci Adv 2024;10(24) doi:10.1126/sciadv.adk5108).
“For COVID, we found that if you only have one test, it's best to wait two days after symptoms arise to use it,