What is ? What to do ? and it's symptoms.

http://en.wikipedia.org/wiki/H1N1
http://en.wikipedia.org/wiki/Influenzavirus_A
http://en.wikipedia.org/wiki/1976_swine_flu_outbreak
http://en.wikipedia.org/wiki/2009_swine_flu_outbreak
http://en.wikipedia.org/wiki/Health_care_in_Mexico
http://en.wikinews.org/wiki/Swine_flu_cases_worldwide_top_1,000
http://news.sky.com/skynews/Topic-Pages/Swine-Flu
http://www1.sky.com/news/NHS_pandemic_update.pdf
http://www.pandemicflu.gov
http://www.cdc.gov/h1n1flu
http://www.who.int/en

I have a doubt about these masks.
http://www.swineflumasks.net/what_protection_do_i_need.html
The filter of these masks do not offer much protection. They will protect others from being contaminated from you in case you are infected.

If you really want to be protected you would advise an organic protection half face mask with at least 10 assinged protection factor (NIOSH 1987) of '10'

I have one like this (see picture) which i use for all kinds of situations if i see the need of breathing protection.

What is a respirator?

A respirator (for example, an N95 or higher filtering facepiece respirator) is designed to protect you from breathing in very small particles, which might contain viruses. These types of respirators fit tightly to the face so that most air is inhaled through the filter material. To work the best way, N95 respirators must be specially fitted for each person who wears one (this is called “fit-testing” and is usually done in a workplace where respirators are used). Most of the time, N95 respirators are used in construction and other jobs that involve dust and small particles. Some healthcare workers, such as nurses and doctors, use these types of respirators when taking care of patients with diseases that can be spread through the air.

These will filter what you breathe for sure.
The choice and health are yours