The recommendation represents a break from past years, when the government focused on vaccinating people in certain "high-risk" groups and those in contact with people at high risk.

"The message is simple now," said David Weber, MD, MPH, professor of medicine, pediatrics and epidemiology at the University of North Carolina at Chapel Hill. "If you're more than 6 months of age, get the vaccine."

"In an average year, there are more than 200,000 hospitalizations and more than 35,000 deaths from flu. Many of those would be preventable by simply getting the flu shot," said Weber. "Flu shots are far and away the best way for preventing flu."

The Advisory Committee on Immunization Practices, a Centers for Disease Control and Prevention (CDC) advisory panel that set the recommendation for universal vaccination cited last year's H1N1 outbreak -- which affected many young, healthy people not traditionally considered to be at high risk for complications from flu -- as part of the reason for the change. In addition, the list of conditions that put a person at high risk has grown so much over the years that many people are unaware of their high-risk status. Universal vaccination is expected to better protect individuals and the population as a whole.

People should receive the vaccine every year as soon as it becomes available, said Weber. "It's important every year. This year it may be more important because anybody who didn't get H1N1 last year is susceptible to it, and since that was the first year H1N1 was around, many people, if not most people, are susceptible."

The vaccine is reformulated each year to provide protection against the virus strains that present the greatest public health threat for that year. People who contracted H1N1 last year may have a lower chance of contracting it again this year, but they should still receive the vaccine for protection against seasonal flu.

Adults need only one dose of the vaccine. Children 6 months to 8 years old may need two doses, depending on which vaccines they received last year.

The vaccine will be available at doctor's offices and at many pharmacies as both a nasal spray and as a shot. The shot is recommended for people younger than 2 or older than 49, and people with a suppressed immune system. The nasal spray is appropriate for most other healthy people.

Note: If no author is given, the source is cited instead.

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