More than 3,000 children received the H1N1 vaccine in Escondido on Saturday.
In an effort to stop the spread of the virus, medical staff from Rady Children's Hospital-San Diego vaccinated the children at two middle schools.
The vaccination clinics, at Hidden Valley Middle School and Mission Middle School, were open to children from 6 months to 18 years old and pregnant women, from 9 a.m. to 4 p.m. It was one of the largest one-day vaccinations at a San Diego County school since school vaccinations clinics began last month.
Rady Children's worked with the county, which supplied the vaccine, and the Escondido Union School District. More than 30 clinical staff from Rady Children's Hospital helped to administer the vaccines.