Which of the following lists common portals of exit and common portals of entry for respiratory pathogens?

• A. Exit: wastewater systems and sewer vents exclusively; Entry: hair follicles and nails as the primary routes for all pathogens
• B. Exit: ears and tear ducts only; Entry: gastrointestinal ingestion exclusively
• C. Exit: nose, mouth, respiratory secretions; Entry: nose, mouth, eyes, skin breaks
• D. Exit: gastrointestinal tract only; Entry: only via insect bite or parenteral introduction into blood vessels

Answer: (C)