Swine influenza (also called H1N1 flu, swine flu, hog flu, and pig flu) is an infection by any one of several types of swine influenza virus. Swine influenza virus (SIV) is any strain of the influenza family of viruses that is endemic in pigs.[2] As of 2009, the known SIV strains include influenza C and the subtypes of influenza A known as H1N1, H1N2, H3N1, H3N2, and H2N3.

Swine influenza virus is common throughout pig populations worldwide. Transmission of the virus from pigs to humans is not common and does not always lead to human influenza, often resulting only in the production of antibodies in the blood. If transmission does cause human influenza, it is called zoonotic swine flu. People with regular exposure to pigs are at increased risk of swine flu infection. The meat of an infected animal poses no risk of infection when properly cooked.

During the mid-20th century, identification of influenza subtypes became possible, allowing accurate diagnosis of transmission to humans. Since then, only 50 such transmissions have been confirmed. These strains of swine flu rarely pass from human to human. Symptoms of zoonotic swine flu in humans are similar to those of influenza and of influenza-like illness in general, namely chills, fever, sore throat, muscle pains, severe headache, coughing, weakness and general discomfort.


Swine Flu Symptoms

According to the CDC, like seasonal flu, symptoms of swine flu infections can include:

* fever, which is usually high, but unlike seasonal flu, is sometimes absent
* cough
* runny nose or stuffy nose
* sore throat
* body aches
* headache
* chills
* fatigue or tiredness, which can be extreme
* diarrhea and vomiting, sometimes, but more commonly seen than with seasonal flu

Signs of a more serious swine flu infection might include pneumonia and respiratory failure.

If your child has symptoms of swine flu, you should avoid other people and call your pediatrician who might do a rapid flu test to see if he has an influenza A infection. Further testing can then be done to see if it is a swine flu infection. (Samples can be sent to local and state health departments and the CDC for confirmation of swine flu, especially if a child is in the hospital.)
Swine Flu High Risk Groups

With regular seasonal flu, infants and the elderly are usually thought to be most at risk for serious infections, in addition to people with chronic medical problems. Swine flu high risk groups, people who are thought to be at risk for serious, life-threatening infections, are a little different and can include:

* pregnant women
* people with chronic medical problems, such as chronic lung disease, like asthma, cardiovascular disease, diabetes, and immunosuppression
* children and adults with obesity

Serious Swine Flu Symptoms

More serious symptoms that would indicate that a child with swine flu would need urgent medical attention include:

* Fast breathing or trouble breathing
* Bluish or gray skin color
* Not drinking enough fluids
* 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

Swine Flu Symptoms vs. a Cold or Sinus Infection

It is important to keep in mind most children with a runny nose or cough will not have swine flu and will not have to see their pediatrician for swine flu testing.

This time of year, many other childhood conditions are common, including:

* spring allergies - runny nose, congestion, and cough
* common cold - runny nose, cough, and low grade fever
* sinus infections - lingering runny nose, cough, and fever
* strep throat - sore throat, fever, and a positive strep test

What You Need To Know

* Swine flu likely spreads by direct contact with respiratory secretions of someone that is sick with swine flu, like if they were coughing and sneezing close to you.

* People with swine flu are likely contagious for one day before and up to seven days after they began to get sick with swine flu symptoms.

* Droplets from a cough or sneeze can also contaminate surfaces, such as a doorknob, drinking glass, or kitchen counter, although these germs likely don't survive for more than a few hours.

* Anti-flu medications, including Tamiflu (oseltamivir) and Relenza (zanamivir), are available to prevent and treat swine flu.

* The latest swine flu news from the CDC includes advice that children should not attend summer camps if they have had swine flu symptoms in the previous seven days and that camp staff should be quick to identify campers with swine flu symptoms and separate them from well campers.