Mutated coronavirus behind seasonal flu‑like illness: TN health officials

Public health authorities in Tamil Nadu have identified a mutated form of the coronavirus as one of the causes behind the current wave of seasonal flu‑like symptoms spreading across the state.

Officials have clarified that although the virus is related to COVID‑19, the strain circulating now shows low virulence and milder impact, meaning there is no need for public alarm at this stage.

Since September 2025, thousands of residents across Tamil Nadu have reported symptoms such as fever, fatigue, dry cough, sore throat, nasal congestion, and joint pains. While many cases resemble ordinary seasonal influenza, health department officials have attributed a significant share of these illnesses to a variant of the coronavirus that has undergone genetic changes but remains less potent than earlier pandemic strains.

Authorities emphasise that the current circulating coronavirus variant is not causing severe disease. Most affected individuals recover within just a few days after standard treatment for flu‑like illnesses. However, some people—especially those with prolonged dry cough lasting up to four to eight weeks—have reported lingering respiratory symptoms even after fever subsides.

Officials noted that mutations in coronaviruses are common and can influence how the virus spreads or affects populations. They reiterated that this wave should be seen as part of the broader pattern of respiratory viruses, which now includes both traditional influenza viruses and evolving coronavirus variants.

Health experts stressed that while the mutated coronavirus appears widely present, its low severity means people should treat current symptoms as they would with seasonal flu: rest, hydration, and symptomatic care. Individuals with prolonged or worsening symptoms should consult medical professionals, especially those who are elderly or have underlying health conditions.

Officials have urged the public not to panic, even as flu‑like illnesses circulate. Preventive measures such as regular hand washing, wearing masks in crowded spaces, and staying home when sick can help reduce transmission of respiratory viruses—be it influenza or coronavirus variants.