2007-8447 2007-8447 S2007-84472017000200061 10.32776/revbiomed.v28i2.575 Mexico Mexico 00 08 2017 00 08 2017 28 2 61 63 1. Centers for Disease Control and Prevention (CDC) 2011 60 31 31 1050-2 2. 1995 3. 2015 9 5 5 4. 2008 131 131 167-75 5. 2006 17 2 2 118-22 6. 1966 27 116 116 24-32 7. 2015 247 11 11 1229 8. 2016