What is the flu?

The flu (influenza) is an infection of the nose, throat, and lungs caused by flu viruses. Flu viruses cause illness, hospital stays and deaths in the United States each year. There are many different flu viruses and sometimes a new flu virus starts spreading among people and making people sick.

What is 2009 H1N1 flu?

2009 H1N1 flu (sometimes called swine flu or novel flu) is a new and very different flu virus that is spreading worldwide among people. This flu season, scientists expect both 2009 H1N1 flu and seasonal flu to cause more people to get sick than a regular flu season. More hospital stays and deaths may also occur.

How serious is the flu?

Most people with 2009 H1N1 have had mild illness and have not needed medical care and the same is true of seasonal flu. However, the flu can be serious, even in people who are otherwise healthy. But flu can be especially serious for young children (risk is higher for children younger than 5, but especially younger than 2 years) and children of any age who have certain chronic medical conditions. These conditions include asthma, neurological and neurodevelopmental conditions, chronic lung disease, heart disease, blood disorders, endocrine disorders (such as diabetes), kidney, liver, and metabolic disorders, and weakened immune systems due to disease or medication. Children with these or other conditions and children who are receiving long-term aspirin therapy can have more severe illness from seasonal and from 2009 H1N1 flu.

How does flu spread?

Both 2009 H1N1 flu and seasonal flu are thought to spread mostly from person to person through the coughs and sneezes of people who are sick with flu. People also may get sick by touching something with flu viruses on it and then touching their mouth, nose or eyes.

What are the symptoms of the flu?

Symptoms of seasonal flu and 2009 H1N1 flu can include fever, cough, sore throat, runny or stuffy nose, body aches, headache, chills, fatigue and sometimes vomiting and diarrhea. Some people sick with the flu will not have a fever.

How long can a sick person spread the flu to others?

People infected with seasonal and 2009 H1N1 flu shed virus and may be able to infect others from 1 day before getting sick to 5 to 7 days after. However, some people can shed virus for longer, especially children and people with weakened immune systems and people infected with 2009 H1N1 flu.

How can I protect my child against flu?

Get a seasonal flu vaccine for yourself and your child to protect against seasonal flu viruses.

Get a 2009 H1N1 vaccine for your child. Ask your doctor about whether you should get one too.

Take – and encourage your child to take – everyday steps that can help prevent the spread of germs. This includes:

Cover coughs and sneezes with a tissue. Throw the  tissue in the trash after you use it.

Stay away from people who are sick. 

Wash hands often with soap and water. If soap  and water are not available, use an alcohol-based hand rub.

Avoid touching your eyes, nose and mouth. Germs spread this way.

If someone in the household is sick, try to keep the sick person in a separate room from others in the household, if possible.

Keep surfaces like bedside tables, surfaces in the bathroom, kitchen counters and toys for children clean by wiping them down with a household disinfectant according to directions on the product label.

Throw away tissues and other disposable items used by sick persons in your household in the trash.

A yearly seasonal flu vaccine is the first and most important step in protecting against seasonal flu. This vaccine is recommended for children 6 months through 18 years of age and all people who are close contacts (caregivers) of children younger than 5 years of age.

A vaccine against 2009 H1N1 flu also is being made. This vaccine is recommended for all children and young adults 6 months through 24 years of age. Other people, including close contacts of children younger than 6 months of age, pregnant women, and adults with certain chronic medical conditions, are recommended for vaccination too. More information about the 2009 H1N1 flu vaccine and the seasonal flu vaccine is available on the CDC Web site.

Is there medicine to treat the flu?

Antiviral drugs can treat both seasonal flu and 2009 H1N1 flu. It’s very important that antiviral drugs be used early to treat flu in people who are very sick (for example people who are in the hospital) and people who are sick with flu and have a greater chance of getting serious flu complications. Other people with flu illness may also benefit from taking antiviral drugs. Antiviral drugs can make people feel better and get better sooner and may prevent serious flu complications. These drugs need to be prescribed by a doctor and they work best when started during the first 2 days of illness. These drugs can be given to children.

What should I use for hand cleaning?

Washing hands with soap and running water (for as long as it takes to sing the "Happy Birthday" song twice) will help protect against many germs. If soap and water are not available, use an alcohol-based hand rub.

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What can I do if my child gets sick?

What if my child seems very sick?

Even children who have always been healthy before or had the flu before can get a severe case of flu.

Call for emergency care or take your child to a doctor right away if your child of any age has any of the warning or emergency signs below:

Fast breathing or trouble breathing 

Bluish or gray skin color 

Not drinking enough fluids (not going to the bathroom or making as much urine as they normally do)

Severe or persistent vomiting 

Not waking up or not interacting 

Being so irritable that the child does not want to be held

Flu-like symptoms improve but then return with fever and worse cough

Has other conditions (like heart or lung disease, diabetes, or asthma) and develops flu symptoms, including a fever and/or cough.

Can my child go to school, day care or camp if he or she is sick?

No. Your child should stay home to rest and to avoid giving the flu to other children.

When can my child go back to school after having the flu?

Keep your child home from school, day care or camp for at least 24 hours after their fever is gone. (Fever should be gone without the use of a fever-reducing medicine.) A fever is defined as 100°F or 37.8°C.

For more information, visit www.cdc.gov or www.flu.gov or call 800-CDC-INFO