Flu Season: Keep the Viruses Away

by Food and Drug Administration (FDA)

The winter months present plenty of opportunities for viruses to spread. Chilly weather keeps more of us indoors at the same time, and the holiday season brings together family members of all ages. Colds and flu (influenza) can occur anytime, but appear mostly in the fall and winter.

For most people, viral respiratory illnesses are usually self-limited and last only a few days. But along with making millions of us feel lousy every year, colds and flu can cause serious problems and can even be deadly. Each year flu complications cause an average of 114,000 hospitalizations and 36,000 deaths, according to the Centers for Disease Control and Prevention (CDC). Death rates are highest for people ages 65 and up and for those with medical conditions that put them at increased risk for flu complications.

Here are tips to ward off colds and flu and to ease the misery if they strike:

Get the flu vaccine.

A vaccine against colds hasn't been developed because colds can be caused by many types of viruses. But the flu vaccine remains the best way to prevent and control the flu.

Influenza viruses are classified as types A, B, or C. Type A and B viruses are the most serious because they are the ones most often responsible for cases of the flu and all of its complications. Type C viruses are mostly associated with cold symptoms.

Flu season in the United States runs from November to April. October to November is the usual vaccination time for most people. "But you can also get good results when the vaccine is used in December and January, even if influenza is already starting to spread through a community," says Roland A. Levandowski, M.D., a medical officer and virologist in the Food and Drug Administration's Center for Biologics Evaluation and Research. We need a new flu shot every year because the predominant flu viruses change every year.

The protective effect of the vaccine starts working rapidly in people who have been previously infected with flu viruses or have received a flu shot in the past. Infection-fighting antibodies in the blood reach a peak about three weeks after these people get the shot. But for some, such as children younger than 9 who haven't been previously vaccinated, two doses of the influenza vaccine about a month apart are recommended for the first vaccination. In older people and in those with chronic illnesses, the shot may not necessarily prevent the flu, but can reduce the symptoms and risk of complications if they do get sick.

The flu vaccine is made of killed virus and can't cause the flu. The most common side effect is soreness at the injection site. The flu shot is not recommended for certain people, including those allergic to eggs. The viruses for flu vaccines are grown in eggs.

In June 2003, the FDA approved FluMist, the first nasally administered flu vaccine to be marketed in the United States. The needle-free vaccine is for healthy children and adolescents ages 5 to 17 and in healthy adults ages 18 to 49. The nasal spray is manufactured by MedImmune Vaccines Inc. of Gaithersburg, Md., and is marketed by MedImmune and Wyeth Vaccines of Philadelphia.

FluMist is also the first live virus influenza vaccine to be approved in the United States. The most common side effects are nasal congestion, runny nose, sore throat, and cough. As with other live virus vaccines, FluMist should not be given to people with suppressed immunity, such as people with AIDS or cancer. The vaccine also shouldn't be given to pregnant women, people with a history of asthma or other reactive airway diseases, people age 50 and over, or to children under 5.

Wash your hands.

Both colds and flu can be passed through coughing, sneezing, and touching surfaces such as doorknobs and telephones. So it's wise to make a habit of washing your hands and to teach children to do the same. This helps you prevent spreading respiratory infections and picking them up from someone else.

According to the American Society for Microbiology, a national survey found that Americans were most likely to say they wash their hands after changing a diaper and before handling food. Most, however, said they don't wash their hands after coughing and sneezing.

The CDC recommends regular scrubbing of your hands with warm, soapy water for about 15 seconds. Touching your nose, mouth, and eyes with contaminated hands makes it easy for cold and flu viruses to enter the body. Others can become ill by just coming in contact with someone who has become infected with a cold or flu virus or who has come in contact with a contaminated area.

Limit exposure to infected people.

Sometimes people are infected with a virus and they don't know it because they haven't experienced symptoms yet. If possible, avoid people who you know have colds and flu. Keep infants away from crowds for the first few months of life. "This is especially important for premature babies who may have underlying abnormalities like lung disease and heart disease," says Larry Pickering, M.D., a fellow of the American Academy of Pediatrics and a pediatrician in Atlanta.

If keeping your distance is too difficult — say in the case of parents who can't help but hold and kiss their sick kids — then, in addition to washing your hands frequently, you can keep surfaces clean with a virus-killing disinfectant available at the grocery store. A solution of 1 part bleach mixed with 10 parts water also is effective in killing viruses.

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FDA is A United States government body that oversees medical devices, including contact lenses, intraocular lenses, excimer lasers and eyedrops. In the US, these products must be approved by the FDA before they can be marketed.