Japanese health experts are expressing concerns about a potential surge in influenza B cases, even as severe influenza A shows signs of declining. This warning follows Japan's worst flu season in five years, prompting ongoing vigilance among health authorities and travelers alike.
Dr. Chan Yu-jiun (詹宇鈞), Director of the Infection Control Center at Taipei Veterans General Hospital, reassured on Friday that current flu vaccines offer protection against both strains. He explains that standard flu vaccines contain at least three viral strains, including two Type A variants (H1N1 and H3N2) and one Type B strain, providing broad-spectrum protection regardless of which type becomes dominant.
Taiwan's typical flu season traditionally spans from October through February. Although last year's season was unusually long, Dr. Chan does not anticipate that a potential shift from Type A to Type B influenza will extend this year's season. He emphasizes that vaccinated individuals should maintain protection against both strains unless new variants emerge that are not covered by current vaccines.
Rather than worrying about seasonal flu transitions, Dr. Chan advises focusing on the emergence of novel influenza strains. He highlights recent cases of human bird flu infections in the U.S. as examples of new variants that require closer monitoring, especially as seasonal flu cases naturally decline heading into spring and summer.