Health Clearance - All volunteers need to update their Health Clearance annually. You will receive a notice via email reminding you to do this prior to the due date. Failure to update your annual Health Clearance may result in termination as this is a hospital policy. You may contact Occupational Health Services at 650-723-5922, if you have any questions. Flu shot – The CDC recommends all healthcare personnel (including volunteers) be vaccinated to prevent disease and its complications including death to patients, coworkers, family, and the community. The Health Clearance and Flu shot are both free for Volunteers.