BANGKOK, THAILAND – A mutated flu strain that partly evaded current vaccines raised concern in Thailand, even as officials reported generally mild illness.
Mutated H3N2 strain spread and weakened protection
The rapidly spreading A H3N2 strain had undergone several genetic changes, described as a K-type mutation, which allowed it to partly escape the effect of the seasonal flu shot. Experts stated that vaccine effectiveness had declined, while the transmission rate increased, potentially leading to more infections.
“Vaccine protection is no longer as comprehensive as it was against the original strains.”
said health experts.
Health ministry monitored record flu levels
Thailand’s Ministry of Public Health closely monitored the situation after the country recorded its highest number of flu cases in the previous year. At first, A H1N1 2009 was the dominant strain, but A H3N2 became predominant by the end of the year. Officials stressed that the course of illness caused by the new variant was generally milder.
Treatments still worked despite mutation
Known antiviral medications remained effective against the mutated virus, ensuring treatment options. Authorities therefore described the situation as serious but manageable. They emphasized that alarm was justified, but panic was not.
Officials urged continued vaccination
Despite reduced effectiveness, health authorities strongly continued to recommend vaccination with the current trivalent vaccine, which was described as safe, low in side effects and low cost.
“Vaccination still provides a certain basic protection and can mitigate severe cases.”
said health authorities. The vaccine did not include the rare Yamagata B strain, which had not been detected for five years.
Updated shot planned for March rollout
For Thailand, a new adapted vaccine for the southern hemisphere was already in preparation and was scheduled to be introduced in March. The timing targeted potential outbreaks during the upcoming rainy season, when humid conditions tended to favour flu transmission. Officials considered this updated vaccine a key element of the revised public health strategy.
Risk assessed as serious but under control
Although the mutation was more contagious, the severity of illness remained similar to that of normal seasonal flu. Risk groups such as older people, children and those with pre-existing conditions were advised to pay particular attention to hygiene and seek medical care early if symptoms appeared. Authorities rated the situation as serious but controllable, calling for vigilance rather than fear.
Hygiene and self-isolation still crucial
Alongside vaccination, officials reiterated basic hygiene rules: frequent handwashing, keeping distance from sick people and coughing or sneezing into one’s elbow. People with flu-like symptoms were urged to stay at home to avoid infecting others. Health authorities said they would continue to keep a close watch on the development of the mutated virus, as Thailand entered the next flu season alert and prepared.