H1N1 (swine) flu is just like any other flu virus in that it affects different people in different ways. Not everyone who gets it will have the same symptoms.
There are estimates that up to a third of the population of the United States and millions of people around the world could contract H1N1 flu before the pandemic is over.
Although the virus will not affect everyone in the same way, we will look at some of the most common ways it affects someone on a day by day basis so you'll be prepared and know what to expect if you or a family member gets it.
This is the day before any symptoms appear. Today, "Emily", who is 27, is feeling fine. She is attending a birthday party, having dinner with friends and unknowingly spreading the virus around. The day before her symptoms appear, Emily is already contagious.