Herd immunity? Only two counties are even close Less than half of eligible people in 45 of the state’s 58 counties have been fully vaccinated for COVID-19. Credit: WNEP Published: 4:25 PM PDT May 18, 2021 Updated: 4:25 PM PDT May 18, 2021 CALIFORNIA, USA — Five months after COVID-19 vaccinations began, only two California counties are close to reaching “herd immunity” while most trail far behind with less than half of their eligible population vaccinated. A CalMatters analysis of state vaccination data found that in nine counties, less than a third of residents ages 16 and over were fully vaccinated as of last week. In 45 of the state’s 58 counties, less than half were vaccinated.