Smithsonian Magazine · People & society

Early Flu Season Emerges; Experts Urge Prompt Vaccination

Flu season has begun earlier than usual in parts of the U.S. and globally, prompting health officials to recommend immediate vaccination.

Flu rates started rising in August and September in western U.S. states, Japan, and the UK, deviating from the typical pattern. This early onset is concerning as many people have not yet received their seasonal flu shots.

The flu is caused by influenza viruses, with H1N1 currently dominant. Symptoms appear one to four days after infection and include fever, cough, and fatigue. Infected individuals are most contagious in the first three days of symptoms.

In the U.S., the flu has historically led to significant hospitalizations and deaths annually. Since 2010, estimates range from 120,000 to 710,000 hospitalizations and 6,300 to 52,000 deaths each year.

The exact reasons for this year's early start are unclear. Theories include a new H1N1 variant that may evade immune systems or reduced recent immunity against the current strain.

While the Southern Hemisphere experienced a severe flu season this summer, it's uncertain if this will directly translate to the Northern Hemisphere. Experts note that an early start does not necessarily predict a more severe season.

Annual flu vaccines are available and adjusted to target predicted circulating strains. Although perfect prediction is difficult, vaccination remains crucial for protection and reducing illness severity. Getting vaccinated as soon as possible is advised.

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