Airborne Viruses: Transmission Dynamics, Examples, and Protection Strategies

What Are Airborne Viruses?

Airborne viruses are pathogens transmitted via aerosols—tiny respiratory particles (≤5 µm) that remain suspended in air for hours, travel beyond 1–2 meters, and can be inhaled deep into the lungs. This contrasts with droplet transmission (larger particles, >5 µm, falling quickly within 1–2 m).

Key Characteristics

• Particle size: 0.1–0.3 µm for individual virions; aerosols typically 0.5–5 µm.
• Persistence: Hours in still indoor air; longer with low humidity, poor ventilation.
• Dispersal: Air currents, HVAC systems, human movement can spread aerosols over long distances indoors.
• Infectious dose: Often low (few virions), especially for measles, varicella, SARS-CoV-2.

Major Airborne Viruses

Protection Measures (Hierarchy of Controls)

1. Source control: Masking (N95/FFP2/KF94 for wearer; surgical masks reduce emission).
2. Ventilation: ≥6 air changes/hour (ACH), HEPA filtration, UVGI, open windows.
3. Administrative: Stay home when sick, reduce crowding, cohorting.
4. Respiratory protection: Fit-tested N95/FFP2 for high-risk settings (healthcare, long-duration indoor exposure).
5. Hygiene: Hand hygiene, surface cleaning (adjunct; fomite transmission is minor for airborne viruses).
6. Vaccination: Reduces susceptibility, severity, and transmission for measles, varicella, influenza, COVID-19.

Understanding airborne transmission is essential for designing safer indoor environments and mitigating respiratory pandemics.

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Virus	Disease	R₀ (Basic Reproduction Number)	Notes
Measles virus	Measles	12–18	Most contagious; vaccine-preventable
Varicella-zoster	Chickenpox/Shingles	10–12	Airborne + contact
SARS-CoV-2	COVID-19	2.5–8 (variant-dependent)	Airborne dominant; superspreading events
Influenza virus	Seasonal flu	1.3–1.8	Mixed droplet/airborne; seasonal
MERS-CoV	MERS	<1 (limited human spread)	Airborne in healthcare settings