Mexico has been at the centre of the global Swine outbreak and health authorities are worried because it will spread quickly, and cause a Pandemic. A Pandemic is when a virus gets out of control and infects lots of people.
The Flu is a virus which actually began thousands of years ago in birds, but over the years all species have developed their own flu. Sometimes the flu can mutate between similar animals including humans. The Flu spreads through coughing and spluttering. The problem is that our bodies aren't prepared for it. We haven't an inbuilt immunity to it and that's why it's making people so sick.
Luckily there are medicines available which can treat the virus and scientists are working hard to create a vaccine.
Meanwhile you can cover your mouth when you cough and wash your hands regularly to help prevent the spread of the disease.
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