Dr. Pappas can be contacted at [email protected]. This letter was published on July 9, 2025, at NEJM.org. No potential conflict of interest relevant to this letter was reported. Zhang B, Thacker D, ...

COVID-19 variant BA.3.2 or "cicada" is not widely circulating in the U.S. yet, but based on trends in Europe, it may become more prominent. Most evidence comes from laboratory data, but there are no ...

Here’s what we’ve learned – and how our understanding has evolved – since the earliest cases of the novel coronavirus were first reported.