CHAIN OF INFECTION

• Susceptible Host - very young & elderly, those with chronic disease, malnourished, immunocompromised
• Microorganism - bacteria, virus, fungus, parasite
• Reservoir/Source - habitat for organism to grow
• Port of Exit - secretions (e.g. saliva), excretions (e.g. urine, feces)
• Modes of Transport - contact, droplet, airborne, vector, fomites
• Port of Entry - mucosa lining, open wound, oral, respiratory/urinary tract