1. WHO, The world health report 2004: changing history, 2004. http://www.who.int/whr/2004/en/.
2. WHO(world health organisation);Media centre, Influenza - fact sheet no 211: April,2009
3. WHO(world health organisation);Media centre, Malaria - fact sheet no 094: April,2012
4. WHO(world health organisation);Media centre, Measles - fact sheet no 286: April,2012
5. Changes in Individual Behavior Could Limit the Spread of Infectious Diseases;Lopez,2006