Experts note unusually early flu activity on the U.S. West Coast
Health specialists say flu cases are rising earlier than normal on the West Coast, driven by an H1N1 strain, and urge timely vaccination and basic hygiene measures.
Health officials report that the United States is entering flu season ahead of schedule, with the Pacific Northwest and California experiencing a noticeable early increase in cases. "Certainly in the Pacific Northwest, and ... in California as well, there has been an early rise in flu cases," said Dr. Helen Chu, a respiratory infections specialist at the University of Washington School of Medicine.
Dr. Chu explained that flu typically begins in the South and Southeast before moving north and west, but this pattern has shifted this year. She added that the current surge appears to involve influenza A, specifically the H1N1 virus. "This early season here in the U.S., which is, again, focused mostly on the West Coast, is dominated by this H1N1 virus," said Dr. Andrew Pekosz, a professor at Johns Hopkins Bloomberg School of Public Health.
Pekosz noted that H1N1 may spread more easily because it can partially evade existing immunity, though the overall impact on the season remains uncertain. Both experts emphasized that vaccination remains the most effective preventive tool. "I think it probably makes sense to get vaccinated a little bit earlier this year," Chu said, while Dr. Kaylan Christianer of Columbia University added that the vaccine takes about two weeks to become fully effective.
The flu shot is recommended for anyone six months and older, with higher-dose options for adults 65 and older and a newer mRNA vaccine for those 50 to 64. An intranasal vaccine (FluMist) is also available for those who prefer a needle-free option. "People shouldn’t delay getting it to find the perfect vaccine, because at the end of the day, the most important thing is getting a flu vaccine," Christianer said.
In addition to vaccination, experts advised standard hygiene practices such as frequent hand washing, wearing masks in crowded settings, and staying home when ill to reduce transmission. "It’s a lot of the things that we do to protect ourselves against any sort of respiratory illness, for example, washing your hands, if you’re in crowded locations, you can consider wearing a mask, if you are sick, staying home from work or kids staying home from school to help prevent the spread of the illness," Christianer said.
The early onset underscores the need for vigilance as flu activity is expected to spread to other regions later in the fall and winter.