A CLOSER LOOK: H1N1 influenza

WASHINGTON -- A never-before-seen strain of swine flu has turned killer in Mexico and is causing milder illness in the U.S. and elsewhere. While authorities say it's not time to panic, they are taking steps to stem the spread and also urging peop...

H1N1 influenza affects travelers
International travelers Alicia Salinas (right) and her husband Genaro wear masks after arriving Monday at Bush Intercontinental Airport in Houston on a flight from Mexico City. U.S. officials advised Americans against most travel to Mexico on Monday as a swine flu virus that began there spread to the United States and beyond. (Associated Press)

WASHINGTON -- A never-before-seen strain of swine flu has turned killer in Mexico and is causing milder illness in the U.S. and elsewhere. While authorities say it's not time to panic, they are taking steps to stem the spread and also urging people to pay close attention to the latest health warnings and take their own precautions.

"Individuals have a key role to play," Dr. Richard Besser, acting chief of the Centers for Disease Control and Prevention, said Monday.

Here's what you need to know:

Q. How do I protect myself and my family?

A. For now, take common-sense precautions. Cover your coughs and sneezes, with a tissue that you throw away or by sneezing into your elbow rather than your hand. Wash hands frequently; if soap and water aren't available, hand gels can substitute. Stay home if you're sick, and keep children home from school if they are.


Q. How easy is it to catch this virus?

A. Scientists don't yet know if it takes fairly close or prolonged contact with someone who's sick or if it's more easily spread. But in general, flu viruses spread through uncovered coughs and sneezes or -- and this is important -- by touching your mouth or nose with unwashed hands. Flu viruses can live on surfaces for several hours, like a doorknob just touched by someone who sneezed into his hand.

Q. In Mexico, officials are handing out face masks. Do I need one?

A. The CDC says there's not good evidence that masks really help outside of health care settings. It's safer just to avoid close contact with someone who's sick and avoid crowded gatherings in places where swine flu is known to be spreading. But if you can't do that, CDC guidelines say it's OK to consider a mask -- just don't let it substitute for good precautions.

Q. Is swine flu treatable?

A. Yes, with the flu drugs Tamiflu or Relenza, but not with two older flu medications.

Q. Is there enough?

A. Yes. The federal government has stockpiled enough of the drugs to treat 50 million people, and many states have additional stocks.


Q. Should I take Tamiflu as a precaution if I'm not sick yet?

A. No. "What are you going to do with it, use it when you get a sniffle?" asks Dr. Marc Siegel of New York University Langone Medical Center and author of "Bird Flu: Everything you Need To Know About The Next Pandemic." Overusing antiviral drugs can help germs become resistant to them.

Q. How big is my risk?

A. For most people, very low. Outside of Mexico, so far clusters of illnesses seem related to Mexican travel. New York City's cluster, for instance, consists of students and family members at one school where some students came back ill from spring break in Mexico.

Q. Why are people dying in Mexico and not so many here?

A. That's a mystery. First, understand that no one really knows just how many people in Mexico are dying of this flu strain, or how many have it. Only a fraction of the suspected deaths have been tested and confirmed as swine flu, and some initially suspected cases were caused by something else.

Q. Should I cancel my planned trip to Mexico?

A. The U.S. did issue a travel advisory Monday discouraging nonessential travel there.


Q. What else is the U.S., or anyone else, doing to try to stop this virus?

A. The U.S. is beginning limited screening of travelers from Mexico, so that the obviously sick can be sent for treatment. Other governments have issued their own travel warnings and restrictions. Mexico is taking the biggest steps, closings that limit most crowded gatherings. In the U.S., communities with clusters of illness also may limit contact.

Q. What are the symptoms?

A. They're similar to regular human flu -- a fever, cough, sore throat, body aches, headache, chills and fatigue. Some people also have diarrhea and vomiting.

Q. How do I know if I should see a doctor? Maybe my symptoms are from something else -- like pollen?

A. Health authorities say if you live in places where swine flu cases have been confirmed, or you recently traveled to Mexico, and you have flulike symptoms, ask your doctor if you need treatment or testing. Allergies won't cause a fever. And run-of-the-mill stomach bugs won't be accompanied by respiratory symptoms.

Q. Is there a vaccine to prevent this new infection?

A. No. And CDC's initial testing suggests that last winter's flu shot didn't offer any cross-protection.


Q. How long would it take to produce a vaccine?

A. A few months. The CDC has created what's called "seed stock" of the new virus that manufacturers would need to start production. But the government hasn't yet decided if the outbreak is bad enough to order that.

Q. What is swine flu?

A. Pigs spread their own strains of influenza and every so often, people catch one, usually after contact with the animals. This new strain is a mix of pig viruses with some human and bird viruses.

Q. So, is it safe to eat pork?

A. Yes. Swine influenza viruses don't spread through food.

H1N1 virus
H1N1 influenza regularly causes outbreaks of influenza in pigs, but human infections have sporadically occurred.

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