A new, highly transmissible COVID-19 strain, dubbed Stratus, is contributing to a rise in infections across the United States, health officials report. While most cases appear mild, particularly among those vaccinated, the variant demonstrates a heightened ability to evade immunity from prior infections and vaccinations.
The emergence of Stratus is notable as it has already surpassed the previously dominant Nimbus strain,known for its rapid spread and causing a particularly severe sore throat often described as “razor blade” throat. This shift underscores the virus’s continued evolution and the ongoing need for vigilance and updated preventative measures.
Stony Brook Medicine reports that the majority of Stratus cases are mild, especially in individuals who have received COVID-19 vaccinations.Though, the strain carries unique mutations that allow it to more effectively bypass antibodies developed through previous infection or immunization.
Nimbus, an Omicron subvariant, caused meaningful illness during the summer of 2025, characterized by the intensely painful sore throat. Despite Nimbus’s efficient binding to human cells and swift transmission, Stratus has demonstrated a greater capacity for infection.
Health experts continue to emphasize the importance of preventative measures, including practicing good hygiene, improving indoor air quality through ventilation and filtration, and staying current with vaccinations. The CDC’s Advisory Committee on Immunization Practices (ACIP) recently recommended the 2025-2026 updated COVID-19 vaccines for all individuals aged 6 months and older,following consultation with a healthcare professional.
