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sfgate.com/cgi-bin/article.cgi?f=/c/a/2011/09/16/BAOB1L547A.DTL
A new state law requires all children in grades seven through 12 to have the vaccine by the first day of school this year, but districts struggling to get families to comply asked for and received a 30-day extension.
The Legislature passed the new pertussis vaccination law last September in response to a rise in the number of cases across the state.
In 2010, there were 9,000 reported cases of whooping cough in California, including 10 infant deaths, according to the state Department of Public Health.
It was the highest number of cases since 1947.