Conduct assigned investigations of suspected and confirmed vaccine-preventable diseases under the technical guidance of the Epidemiology Manager/Clinical Services Administrator, including case interviews, vaccination-history verification, exposure assessments, contact identification and follow-up, and coordination of specimen collection and laboratory testing. Implement and monitor City cash-handling policies: authorized cashier access, receipts for all collections, secure custody, daily cash drawer balancing, independent reconciliation, deposit preparation, timely deposits, discrepancy escalation and retention of auditable records; coordinate with Finance and Billing.