In California, a recent law passed that mandates pertussis vaccination for children in 7th-12th grades starting July 1st, 2011.  According to the California Department of Public Health,

"Beginning July 1, 2011, all students entering 7th through 12th grades in both public and private schools will be required to show proof of a Tdap (Tetanus toxoid, reduced diphtheria toxoid and acellular pertussis vaccine)booster shot before starting school. This requirement applies to all public and private schools."

Information on Adacel/Tdap vaccination can be found at:

http://www.cdc.gov/vaccines/Pubs/vis/downloads/vis-td-tdap.pdf