Try to avoid close contact if you are ill with the flu or if others around you have flu like symptoms.
In Mexico, TelCel, the country's biggest mobile operator, plans this month to launch a service that allows customers to determine whether they have flu using their mobile phones.
Patients who suspect they or those they care for have flu are urged to contact NHS Direct on 0845 46 47 or to telephone their GP for advice.
The university estimates about 340 students, or 1 percent of the student body, have flu they suspect is H1N1, said Patricia Denning, medical chief of staff at Watkins Health Center.
The idea is that people can immediately find out whether they have the flu or have no illness at all.
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Overall, 17 U.S. states have high flu activity, 28 have moderate activity, and only five have low activity, according to the search engine.
Except for hospitalized patients, others with flu-like symptoms are not being tested to confirm they have swine flu, since "virtually all of the influenza that's circulating right now in the United States is the 2009 H1N1 strain, " Schuchat said.
And so, what we're saying is that if you have the flu, you stay home for seven days, and add one day on after your symptoms have gone away.
The man stays home from work again the next day, claiming to have the flu.
"I walked in and said 'I'm from Mexico but I don't have Swine flu', " she says, joking.
Here are five things you can do when you have the flu, and five that are probably a waste of time.
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Fort Worth schools will be closed at least until May 12, authorities said, announcing that one student was confirmed to have swine flu.
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There are things you can do to minimise some risks such as have a flu jab, stay warm and wash your hands regularly.
Such a service would go a long way in eliminating infection spread within aircraft. iReport.com: Have swine flu fears altered your travel plans?
The National Public Health Service (NPHS) said not all of these people would have swine flu and not everyone with flu-like symptoms would contact their GP.
Margaret Duchez, 94, did not have the flu, but remembers that in 1918 her grandmother locked the door so that she couldn't go outside during the pandemic.
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It is important to mention that individuals that already have the flu who then become more ill during the duration of the illness, (difficulty breathing, or shortness of breath) need to seek medical attention immediately in an emergency department, as the risk of secondary pneumonia rises with an abrupt deterioration of your condition.
Other strains of bird flu have spread to humans and prompted authorities to slaughter animals.
Studies in guinea pigs have shown that flu is easier to transmit in cold, dry conditions.
There have been 18 flu-related deaths this season in Massachusetts, CNN affiliate WCVB reported.
The catch, Canadian officials say, is that the animals may have caught the flu from a human.
It takes about 2 weeks to build up immunity (antibodies) to influenza after you have had the flu shot.
That means that of every 10 people who would have gotten the flu without the shot, three or four still will.
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In addition, the agency says, four children have died of flu-related complications this flu season, with deaths in Texas, Colorado, New York, and Tennessee.
What proportion of people with reported swine flu have been hospitalised?
Most of the time, people who get sick from swine flu have been in contact with pigs, and the virus doesn't spread from person to person.
In the United States, at least 5, 469 cases of swine flu have been reported, according to the latest figures from the Centers for Disease Control and Prevention.
Almost 20, 000 cases of flu have been reported in New York state so far this season - more than four times the number of cases last winter.
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