The San Francisco Department of Public Health (SFDPH) coordinates cryptosporidiosis
surveillance for the five counties served by the San Francisco Public Utilities Commission. SFDPH is cooperating with the California Emerging
Infections Program to gather cryptosporidiosis surveillance data in San Francisco and Alameda counties. In
the remaining counties (San Mateo, Santa Clara, and Tuolumne), SFDPH established contact with 21
laboratories to institute an ongoing, active, lab-based surveillance system. Of these, 16 (76%) originally
agreed to report cryptosporidiosis data to SFDPH, and two (10%) are reporting to California Emerging Infections Program (CEIP), for an overall
participation rate of 86%. Three laboratories (14%) have refused to participate. Two of the laboratories that
have declined to participate are commercial reference facilities and one is a commercial lab with many local
branches. Non-commercial local laboratories served by the reference labs are participating in the
surveillance project and are serving as a proxy measure of reference lab activity. Further surveillance
information is obtained from the public health departments in each county. Includes tables, figures.