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W
- Wastewater research
- West Nile fever
- WHO Collaborating Centre for Antimicrobial Resistance Epidemiology and Surveillance
- WHO Collaborating Centre for Immunotoxicology and Allergic Hypersensitivity; discontinued
- WHO Collaborating Centre for Infectious Disease Preparedness and IHR monitoring and evaluation
- WHO Collaborating Centre for Laboratory Preparedness and Response for High Threat Pathogens and Biorisk
- WHO Collaborating Centre for Nutrition
- WHO Collaborating Centre for Risk Assessment of Pathogens in Food and Water
- WHO Collaborating Centre for Smallpox Vaccine
- WHO Collaborating Centre for the Family of International Classifications (FIC)
- WHO Collaborating Centre for Tobacco Product Regulation and Control
- WHO Collaborating Centre on Behavioural Science for Health Emergency Preparedness and Resilience
- WHO Collaborating Centre on Chemical Food Safety
- WHO Collaborating Centre on Life Course and Health
- WHO Collaborating Centres
- Whooping cough