What are the recommended prevention and treatment strategies for airborne viruses, including vaccination, respiratory protection, and environmental controls?

Airborne Respiruses: Prevention and Treatment Strategy (prioritizing morbidity, mortality, and quality of life)

Bold Recommendation: Use layered controls with vaccination, high-quality respiratory protection (fit-tested N95 or higher), optimized ventilation/air cleaning, rigorous isolation/cohorting, and early pathogen-directed antivirals to reduce severe disease and death from airborne viruses. 1, 2, 3

1) Immediate Risk Stratification (who you must protect most to reduce morbidity/mortality)

• Highest risk: age ≥65, chronic heart/lung disease, immunocompromised, pregnancy, infants (especially <6 months), HSCT/solid-organ transplant, and long-term–care residents. Prioritize these for all interventions and rapid testing/treatment. 4

2) Vaccination and Passive Immunization (primary prevention with best impact on severe outcomes)

• Influenza: vaccinate all unvaccinated patients and healthcare personnel each season; implement outbreak vaccination in facilities. Strong recommendation. 4
• RSV: follow current season guidance for eligible infants/children for monoclonal antibody prophylaxis (palivizumab where indicated) and maternal/older-adult vaccination per current season availability. These reduce hospitalizations. 4, 5
• SARS-CoV-2: ensure up-to-date vaccination/boosters for all, especially high-risk groups (reduces hospitalization/death). 2
• Facility policy: offer vaccines on-site, at no cost, with education and tracking for healthcare workers. 4

Common pitfall: deferring vaccination until “peak season.” Avoid delays—vaccinate at first opportunity. 4

3) Respiratory Protection (source and recipient control)

• Healthcare/high-risk indoor settings:
  • Prefer N95 (or higher) for patient care when community transmission is high or when caring for suspected/confirmed respiratory viral infections; surgical masks are inferior for aerosols. 2
  • Universal masking during surges; ensure masks for patients during transport. 4, 2
• Community/Workplaces:
  • Wear well-fitted high-filtration masks (N95/FFP2/KN95) indoors, especially when ventilation is limited or crowding is present. Strong recommendation. 1, 3

Pitfall: relying only on “3 feet” droplet rules; aerosol spread occurs beyond this. Use N95s and ventilation. 2

4) Environmental and Administrative Controls (reduce inhalation dose and transmission chains)

• Ventilation:
  • Target ≥5–6 ACH where feasible; increase outdoor air intake. Each ACH increment meaningfully reduces aerosol exposure (~5% per ACH in testing). 3
• Air cleaning:
  • Deploy portable HEPA units to supplement poor HVAC or in shared rooms; position to optimize air mixing. 3
• Space management:
  • Private rooms or cohort by same pathogen; minimize room sharing when possible. 4, 2
• Visitor and staff policies:
  • Exclude symptomatic visitors from high-risk wards; evaluate symptomatic staff promptly and remove from direct care as needed. 4

Pitfall: assuming “airborne precautions” needed only for AGPs; normal breathing/talking can exceed AGP