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Updated: May 9, 2026
Monitoring Influenza Virus Survival Outside the Host Using Real-Time Cell Analysis
Published on: February 20, 2021
Survival of influenza virus on human fingers
Y Thomas1, P Boquete-Suter, D Koch
1Laboratory of Virology and Swiss National Reference Center for Influenza, Division of Infectious Diseases and Division of Laboratory Medicine, University Hospitals of Geneva and Medical School, University of Geneva, Geneva, Switzerland.
Abstract:
Indirect transmission of the influenza virus via finger contamination with respiratory mucus droplets has been hypothesized to contribute to transmission in the community. Under laboratory conditions, influenza-infected respiratory droplets were reconstituted as close as possible to natural conditions. We investigated experimentally the survival of influenza A (H3N2) and A (H1N1)pdm09 viruses on human fingers. Infectious virus was easily recoverable on all fingers 1 min after fingertip contamination but then decreased very rapidly. After 30 min, infectious virus was detectable in only a small minority of subjects. Infectious viruses were detected for a longer period of time when droplets of larger size containing a higher number of particles were tested or when the viral concentration increased. A rapid decrease in infectiousness was observed when droplet integrity was disrupted. Our findings could help to set up the promotion of hand hygiene to prevent influenza hand contamination.
Insights
Influenza virus on fingers rapidly decreases, with infectious virus rarely detected after 30 minutes. Larger droplets and higher concentrations prolonged survival, highlighting hand hygiene importance for preventing flu transmission.
Area of Science:
- Virology
- Infectious Diseases
- Public Health
Background:
- Indirect transmission of influenza virus via finger contamination is a suspected community spread mechanism.
- Respiratory mucus droplets are the primary vehicle for indirect influenza transmission.
Purpose of the Study:
- To experimentally investigate the survival of influenza A (H3N2) and A (H1N1)pdm09 viruses on human fingers.
- To understand the factors influencing influenza virus viability on skin surfaces.
Main Methods:
- Influenza A (H3N2) and A (H1N1)pdm09 viruses were applied to human fingertips under simulated natural conditions.
- Virus recovery and infectivity were assessed at various time points post-contamination.
- The impact of droplet size, particle concentration, and droplet integrity on virus survival was evaluated.
Main Results:
- Infectious influenza virus was readily recovered from fingers within 1 minute of contamination.
- Virus infectivity decreased rapidly, with detection in only a few subjects after 30 minutes.
- Larger droplet size, higher viral concentration, and intact droplet structure correlated with longer virus detection times.
Conclusions:
- Influenza virus survival on human fingers is transient under typical conditions.
- Hand hygiene promotion is crucial for mitigating influenza transmission routes involving hand contamination.
