• Falling Immunization Rates

    In recent years, the number of Bay Area kindergartners who have been immunized against diseases like whooping cough and measles has declined. With the 2011-12 school year beginning, we collected the latest data covering last year from the California Department of Health, so you can see which schools are most susceptible to an infectious outbreak. Search for a school or select a county to see more data, or keep reading by clicking on the next chart.

  • Personal Beliefs in Play

    California is one of 20 states that allows parents to exempt their children from mandatory vaccinations by citing “personal beliefs.” Over the last 20 years, Marin and Sonoma counties have consistently had the highest rates of personal belief exemptions among Bay Area counties, which officials say contributed to last year’s especially potent outbreak of whooping cough in those areas.

  • A Historic Outbreak

    Last year marked California’s worst whooping cough epidemic in 60 years. The spread of the disease, which harms mostly infants, school-aged children and the elderly, has sent shock waves through Bay Area communities. An immunization push, combined with the natural ebb of the disease, has led to a decrease in reported cases throughout the Bay Area since last year, but infection rates are still above normal, according to the state Department of Public Health.



By the Numbers: Bay Area Counties

All statistics are for kindergarten enrollment at start of the 2010-11 school year.

View all Cities | View all School Districts | View all Schools

Up-to-date immunization rate

School Type Rate
Public 91.82%
Private 87.79%
Statewide immunization rate 90.76%
Total 91.27%

Conditional entrance rate

School Type Rate
Public 6.00%
Private 8.49%
Total 6.34%

Personal belief exemption rate

School Type Rate
Public 2.16%
Private 3.56%
Statewide exemption rate 2.28%
Total 2.16%

Enrolled kindergartners

School Type Count
Public 76,508
Private 12,077
Total 88,585

Immunization and Enrollment Statistics by County

What percent of kindergartners were fully immunized by the start of the 2010-11 school year in each county? How many kindergartners' parents opted out? Click a column name to sort.

County Up-to-date immunization rate Personal belief exemption rate Total kindergarten enrollment Public school enrollment Private school enrollment
Alameda 90.22% 1.22% 17,721 87.96% 12.04%
Contra Costa 92.12% 2.08% 13,868 90.32% 9.68%
Marin 82.94% 7.06% 3,270 79.91% 20.09%
Napa 93.71% 2.41% 1,700 92.65% 7.35%
San Francisco 89.06% 1.19% 6,489 71.80% 28.20%
San Mateo 88.77% 2.04% 9,110 85.36% 14.64%
Santa Clara 93.66% 1.78% 25,329 84.38% 15.62%
Solano 94.69% 1.37% 5,183 92.05% 7.95%
Sonoma 89.40% 5.98% 5,915 95.16% 4.84%

Quick Facts

Quick Fact: In Bay Area Counties, 2.16% of kindergartners weren't fully immunized in the 2010-11 school year due to their parents' personal beliefs.

Data Finder

Search for a Bay Area school by name.

Only schools with kindergarten students are included.

Pick city or county

Alameda
Contra Costa
Marin
Napa
San Francisco
San Mateo
Santa Clara
Solano
Sonoma

Glossary

'Up to Date' and 'Conditional'
About Personal Belief Exemptions

At the start of the school year, kindergarteners must have been adequately vaccinated for polio, diphtheria, tetanus, whooping cough, measles, mumps, rubella, hepatitis B and chicken pox (or have had chicken pox). Under some circumstances, a child may start kindergarten if he or she is not fully vaccinated and does not have a personal belief exemption or permanent medical exemption, but these children are considered "conditional entrants," and the school must follow up, according to the California Department of Public Health.

For The Bay Citizen's coverage of the whooping cough epidemic, clickhere.

About Personal Belief Exceptions

It's easy for parents in California to get a personal belief exemption for their child. They need only sign a statement provided on their school’s immunization form. Some other states make it tougher, requiring parents to write a letter explaining their decision. Ironically, it's easier to opt out of school vaccinations in California than to provide documentation of a child's vaccination history. A very small fraction of children cannot receive immunizations for medical reasons and receive a "permanent medical exemption."

Note that the data encompasses schools with 10 or more kindergartners enrolled in fall 2010. City, county, and district data reflects where the schools are located. Some students do not live in the same county or city where they attend school.

Conditional Entrants

Some kindergartners who enter school without any immunizations do not cite an exemption, but instead promise to be vaccinated in the near future. Schools are required to follow up.