Relative timing of symptom onset, infectiousness, and detectability vary by pathogen and individual. Symptom onset time (open circles), infectious period (shaded rectangles), and window of detectability by an RDT (colored lines) are shown for 15 stochastic realizations of RSV [(A) orange], influenza A [(B) pink], and SARS-CoV-2 omicron/experienced [(C) green] infections. Credit: Science Advances (2024). DOI: 10.1126/sciadv.adk5108 Peek in medicine cabinets across the U.S. and you’ll find stacks of leftover COVID tests. When symptoms arise, so do questions: When should I test? How accurate is it really? And what should Read More