Natomas, CA school officials are going door to door with a traveling nurse to give whooping cough shots to unvaccinated students.
A new state law requires students entering seventh through 12th grades to get vaccinated against the disease by the start of the 2011-12 school year.
The legislature gave districts 30 days beyond the start of the school year to make sure all students were vaccinated or had a formal exemption filed by their parents or guardians.
As the deadline passes, thousands of students remain unvaccinated. Many school districts have been defying state law and allowing them on campus.
But not anymore in Natomas.