Knowledge of: Principles, policies, procedures, methods, and techniques specific to infectious disease control, prevention, and public health; principles and practices of field investigation; interviewing and motivational counseling techniques and principles; confidentiality guidelines; communicable disease etiology, manifestations, progression, diagnosis, and treatment; medical and drug terminology; laboratory testing procedures; lab report analysis for infectious diseases; epidemiology, contact investigation, tracing, and notification of communicable diseases; all types of sexually transmitted diseases, particularly reportable sexually transmitted infections; their health effects, methods of transmission, prevention, treatment, and effect on families and social institutions; availability of community resources and methods to ensure that patients are linked to care; record keeping procedures and basic statistical methods; personal safety techniques; harm reduction principles. Conducts interviews of clients diagnosed with or potentially exposed to sexually transmitted and other communicable diseases; provides confidential counseling, referral to testing and other services for clients and named contacts of potentially infected persons; analyzes electronic medical records to ensure adequate treatment has been completed per Center for Disease Control (CDC) STI Treatment Guidelines and Washington State Notifiable condition guidelines; conducts follow-up and referrals to ensure examination and treatment compliance for infected, exposed, and at-risk individuals; performs partner elicitation, notification and facilitates access to necessary treatment.