Oh my God! Swine Flu OutBreak

27 April 2009 -The World Health Organization has called it a "public health emergency of international concern."

A girl in Mexico City wears a mask outside a church on Sunday.
more photos » Seemingly out of nowhere, the swine flu virus has spread from person to person in Mexico and the United States, triggering global concerns as governments scramble to find ways to prevent further outbreak.

Q. What is swine flu?

A. Swine influenza, or flu, is a contagious respiratory disease that affects pigs. It is caused by a type-A influenza virus. Outbreaks in pigs occur year-round.

The most common version is H1N1. The current strain is a new variation of an H1N1 virus, which is a mix of human and animal versions.

Q. Does swine flu affect humans?

A. While the virus causes regular outbreaks in pigs, people usually are not struck by swine flu. However, there have been instances of the virus spreading to people -- and then from one person to another. The only difference is, says the CDC, transmission in the past did not spread beyond three people -- as it has done this time.

Q. What is behind the spread of the virus this time?
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With swine flu outbreaks creating what U.S. health officials Sunday called a public health emergency, LiveScience presents a 4-part Flu Special Report this week to examines the science of influenza, what you can do to be safe, and the risk of a pandemic. Part 1 today: Flu basics.


The flu virus is most commonly spread in liquid droplets made airborne by coughing or sneezing. Symptoms - such as fever, body ache, extreme fatigue, sore throat, and dry cough - begin showing in adults one to four days after being infected.


The new strain of swine flu is spreading from human to human, but the Centers for Disease Control and Prevention (CDC) doesn't yet know how contagious it is. Bird flu, which has in recent years concerned scientists, has been slow to transmit between humans.


A study in 2006 showed that modern travel could contribute to spreading a flu pandemic across the United States in as little as three months.


An adult can begin spreading the flu virus one day before and three to seven days after symptoms show, and children can remain contagious even longer. Some infected individuals show no symptoms, yet they can still spread the virus to others.

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