As of March 2026, subvariants of Omicron remain the dominant COVID-19 strains circulating globally , with no major shifts to entirely new lineages reported recently.

Dominant Strains Right Now

These Omicron descendants are leading case numbers, based on the latest surveillance data:

  • XFG : Holds about 29% of U.S. cases; a fast-spreading subvariant first documented in early 2025.
  • NB.1.8.1 : Accounts for roughly 21% of cases; part of the Omicron family and increasingly prevalent this year.
  • XFG.2.5.1 : Makes up around 16%; another rising Omicron offshoot.

Other monitored variants under WHO tracking include KP.3.1.1 , LP.8.1 , and BA.3.2 , but they're not yet dominant.

Why These Strains?

Omicron's original form has evolved into these highly transmissible subvariants due to ongoing mutations in the spike protein, helping them partially evade immunity from vaccines or prior infections. In the U.S. and Europe, wastewater and sequencing data show XFG and kin driving spring 2026 surges , similar to how earlier ones like XEC fueled winter waves. Doctors note these strains spread efficiently in crowded settings but tend to cause milder illness in vaccinated folks compared to early pandemic variants like Delta.

Common Symptoms

Expect upper respiratory issues over severe pneumonia:

  • Sore throat (often first sign)
  • Runny/stuffy nose
  • Dry cough
  • Fatigue and headache
  • Occasional fever or loss of taste/smell (less common now)

Trends & Precautions

Cases are ticking up in March 2026 , per recent reports, amid relaxed public health measures—echoing patterns from 2025. Stay protected with the latest boosters targeting JN.1-lineage strains (covering XFG/NB.1.8.1), good ventilation, and testing if symptoms hit. High-risk groups (elderly, immunocompromised) should mask in crowds.

TL;DR : XFG leads, followed by NB.1.8.1 and XFG.2.5.1—all Omicron subvariants. Milder but spreading; vaccinate and test smartly.

Information gathered from public forums or data available on the internet and portrayed here.