Summer Cold or COVID-19? Understanding Summer Viruses and the Stratus Variant

During warm months filled with outdoor activities and sunshine, many assume that cold and flu season is over. However, summer illnesses like colds, COVID-19, and RSV are still prevalent and can even spike during this time. Recent federal data indicates an upward trend in COVID-19 cases in many states, with emergency department visits rising across all age groups. A new COVID-19 variant called Stratus (XFG) is now the most common in the U.S. Wastewater analysis suggests moderate activity levels of COVID-19, and the variant is known to cause symptoms like severe sore throats—a phenomenon sometimes referred to as "razor blade" sore throat. Despite the overlap in symptoms, immunity from vaccines remains effective against Stratus, which is only slightly better at evading immune responses compared to previous strains.

While many believe viruses are less active in the summer, this isn't entirely accurate. The apparent decrease in seasonal viruses is partly due to behavioral factors, such as more outdoor gatherings which reduce transmission, rather than weather alone. Cold weather does facilitate virus spread, but increased indoor activity during hot weather, especially in air-conditioned environments, can promote transmission.

As for COVID-19 vaccination, timing remains key. If you're planning a trip or an event, getting a booster a few weeks beforehand is advisable. However, most experts suggest waiting until fall to boost protection ahead of the potential winter surge. High-risk groups, including older adults or immunocompromised individuals, should consult with their healthcare providers about the best booster schedule.

Children under 4 are experiencing a rise in COVID-19-related emergency visits, likely because many are encountering the virus for the first time or haven't been vaccinated. Though some health authorities have questioned the need for vaccines in healthy children, major pediatric health organizations continue to recommend COVID-19 shots for children over six months old.

Preventative measures such as outdoor activities, hand hygiene, mask-wearing, and staying home when sick are effective strategies to reduce risks during the summer months. Staying informed and cautious remains essential as viruses continue to circulate year-round.

Source: https://medicalxpress.com/news/2025-08-sniffles-summer-colds-covid-variant.html