Tue Feb 04 21:50:00 IST 2025: ## Flu Season Intensifies: Experts Detail Differences Between Influenza A and B

**New York, NY** – The U.S. is experiencing a significant flu season surge, with hospitals strained by a high volume of cases. While symptoms are largely indistinguishable, understanding the differences between influenza A and B is crucial for effective prevention and treatment.

According to Dr. Sean T. Liu of the Icahn School of Medicine at Mount Sinai, and Dr. Stuart Ray of Johns Hopkins University School of Medicine, the current season is predominantly driven by influenza A variants, specifically H1N1 and H3N2. Influenza A is generally considered more severe and historically responsible for pandemics, unlike influenza B, which only infects humans and tends to be milder. However, both can lead to serious complications.

While flu season typically runs from October to March/April, the timing and severity of A and B strains can vary yearly. Experts note that influenza A usually appears earlier in the season, with influenza B cases rising later.

Symptoms for both A and B are similar, encompassing fever, cough, sore throat, muscle aches, and fatigue. Gastrointestinal issues can also occur, particularly in children. Distinguishing between the two strains requires testing as symptoms alone are not sufficient for diagnosis. Potential complications include pneumonia and, in rare cases, encephalitis.

The annual flu vaccine protects against selected strains of both A and B. This year’s vaccine composition reflects current circulating viruses, with the notable absence of the Yamagata lineage of influenza B, which is believed to be extinct due to COVID-19 preventative measures.

Besides vaccination, preventative measures include frequent handwashing, mask-wearing in public, and avoiding raw eggs and unpasteurized milk due to the ongoing threat of avian flu. At-home combination tests can detect both flu and COVID-19, aiding in timely diagnosis. Antiviral treatments, such as oseltamivir (Tamiflu), are effective against both A and B strains and are particularly important for individuals with underlying health conditions.

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