New 'Cicada' Covid Variant Spreads; Flu, RSV Still High

Several respiratory viruses, including influenza, a new COVID-19 variant dubbed 'cicada' (BA.3.2), and RSV, continue to circulate in the United States. Many of these illnesses share similar symptoms like coughs and fevers, making testing essential for accurate identification. While influenza A cases have decreased nationally since January, other viruses remain active. Arkansas, North Dakota, Vermont, and Wyoming are still experiencing moderate respiratory illness levels, with RSV remaining high in states such as Michigan and Nebraska.

The 'cicada' COVID-19 variant, detected in wastewater and nasal swabs across 25 states, possesses mutations that may allow it to evade prior immunity. Currently, BA.3.2 accounts for a small fraction of detected COVID-19 viruses. Although COVID-19 cases are at low levels nationwide, some states like Florida and Massachusetts show a slight increase. Experts are monitoring the situation but note that previous variants with similar immunological distinctiveness have not led to significant case surges.

RSV, which typically appears early in the season, is showing abnormal persistence. Many states still report moderate to high levels of RSV, and some recommend antibody treatments for newborns. Human metapneumovirus (HMPV), a relative of RSV, is also circulating at high levels, with its peak expected around mid-April. Separately, norovirus, a gastrointestinal bug, remains at high levels nationally, although its prevalence is lower than in the previous year.