Preparedness The City’s efforts to be prepared for health emergencies. Services Volunteer for the Philadelphia Medical Reserve Corps (MRC) How to volunteer for the Philadelphia Medical Reserve Corps (MRC). Protect yourself from West Nile virus and Lyme disease Learn how to protect yourself from West Nile virus and Lyme disease. Programs Bioterrorism and Public Health Preparedness Program Preparing Philadelphia for public health emergencies. Philadelphia Medical Reserve Corps (MRC) Supporting the City's first responders during public health emergencies and citywide special events.