One word answer to prevent Swine Flu - Yoga

Live a yogic lifestyle. Almost all the precautions I have read match with Yogic way of living. 

In addition, Yoga has very good cleansing techniques like Jal Neti for Nasal cleansing. It treats even sinus infections / ENT disorders. 

Enema cleanses the colon of toxins and makes the immune cells stronger to fight the such diseases.

Nauli increases the flow of life force which is required for anything you might want to do.

So, simply follow Yogic Morning Daily Cleansing Routine.

If get affected you should know What should you do immediately?

Some useful links - 

• Indian Natural herbs for Swine Flu
• Swine Flu Guide