The National Institute of Health (NIH) has released a precautionary advisory following a noticeable rise in seasonal influenza cases, particularly linked to the H3N2 strain, both in Pakistan and across several regions worldwide. The alert focuses on early prevention and effective management to reduce the risk of widespread transmission in the coming months.
In its advisory, the NIH has asked provincial health departments and relevant institutions to take timely preventive steps and strengthen monitoring systems. Hospitals and healthcare centers have also been advised to prepare for a possible increase in patients, both in outpatient clinics and hospital wards, as flu activity is expected to rise during the seasonal peak.
The institute explained that influenza is a highly contagious viral respiratory illness caused mainly by Influenza A and B viruses. These viruses trigger seasonal outbreaks every year and can spread rapidly through coughing, sneezing, or close contact. Influenza A, in particular, is known to spread more quickly and often leads to severe illness. Vulnerable groups include elderly people, young children, pregnant women, and individuals with underlying health conditions such as asthma, diabetes, heart disease, or chronic lung problems.
According to the NIH, a newly identified genetic subclade of Influenza A (H3N2), referred to as Subclade K, has been detected during the 2025–2026 flu season. Data shared by the World Health Organization shows a sharp increase in H3N2 cases in several monitored regions since August 2025.
The advisory also highlighted trends in South-East Asia, where influenza detection rates have risen significantly. Between May and late November 2025, H3N2 accounted for nearly two-thirds of all reported Influenza A cases in the region.
The NIH has urged health authorities, medical professionals, and the public to remain alert, follow preventive measures, and seek timely medical care to limit the impact of the flu season and protect high-risk populations.
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