Seasonal Flu

In the U.S, flu season typically occurs between October to March or April of each year. Flu vaccine is recommended annually for persons at risk for influenza-related complications, and this year will be given at Public Health Centers and other locations throughout the County during September, October, November, December and later. For updated flu clinic location information, please visit after September 1 or call 2-1-1.

What is seasonal flu?

Influenza (“flu”) is a virus that typically affects the nose, throat, and lungs. The illness usually lasts between three and seven days and symptoms include fever, headache, cough, aches and sore throat.

Seasonal flu is a respiratory illness caused by an influenza virus, which spreads easily from person to person. Following are some key facts about seasonal influenza*:

Each year about 10% of the population becomes ill with seasonal flu.

For most, the illness is unpleasant but not life threatening.

The very young and those over 65 years old are at greater risk of serious complications. So are those with:

Other chronic conditions, such as kidney, lung or heart disease

Annual flu vaccine is the best way to protect against seasonal flu.

What is the difference between pandemic influenza and seasonal influenza?

Seasonal outbreaks (epidemics) are caused by subtypes of influenza viruses that are already in existence among people, whereas pandemic outbreaks are caused by new subtypes or by subtypes that have never circulated (spread) among people or that have not circulated among people for a long time. Past influenza pandemics have led to high levels of illness, death, social disruption, and economic loss.