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Tick Surveillance

Photograph of a small brown tick on a blade of grass

The District collects ticks from around the County and tests for tick-borne diseases, including: 

MIP stands for Minimum Infection Prevalence 
Estimate of the lowest percent of individuals carrying a germ

The results of these tests are reported as the minimum infection prevalence, or MIP. This is a way of describing the proportion of ticks tested that are infected with a particular pathogen. MIP is typically reported for each park surveyed (with the exception of parks where there were not enough ticks collected to complete testing), and for the parks as a whole.

A MIP of 2-3% is considered normal for our county, and does not indicate an elevated level of risk.

For more information on how the District collects ticks for disease surveillance, visit the Tick Control and Monitoring page.

The risk of acquiring tick-borne disease in San Mateo County remains relatively low, however, we caution all residents to be careful when walking on trails or in regions with tall grasses. Click HERE to learn more about how to protect yourself from tick bites and the diseases that ticks can spread.

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