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Zoonotic Diseases CDC Disease Severity Disease Transmission Human Health Risks Infectious Diseases Exposure Chemical Safety General Public Toxic Substances Toxicology Health Agencies Contact Tracing Infection Risks Infection Sources COVID-19 Public Perception Disease Spread Health Security Foodborne Pathogens Health Guidelines Disease Surveillance COVID-19 Variants Infectious Disease Control Influenza Avian Influenza CDC Guidelines Pandemic Potential Infection Control Epidemiology Potential Impact Human Cases Animal Contact Disease Outbreaks Flooding Risks Health Organizations