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© Research
Publication : PLoS pathogens

Minimal transmission in an influenza A (H3N2) human challenge-transmission model within a controlled exposure environment.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in PLoS pathogens - 01 Jul 2020

Nguyen-Van-Tam JS, Killingley B, Enstone J, Hewitt M, Pantelic J, Grantham ML, Bueno de Mesquita PJ, Lambkin-Williams R, Gilbert A, Mann A, Forni J, Noakes CJ, Levine MZ, Berman L, Lindstrom S, Cauchemez S, Bischoff W, Tellier R, Milton DK, ,

Link to Pubmed [PMID] – 32658939

Link to DOI – 10.1371/journal.ppat.1008704

PLoS Pathog 2020 07; 16(7): e1008704

Uncertainty about the importance of influenza transmission by airborne droplet nuclei generates controversy for infection control. Human challenge-transmission studies have been supported as the most promising approach to fill this knowledge gap. Healthy, seronegative volunteer ‘Donors’ (n = 52) were randomly selected for intranasal challenge with influenza A/Wisconsin/67/2005 (H3N2). ‘Recipients’ randomized to Intervention (IR, n = 40) or Control (CR, n = 35) groups were exposed to Donors for four days. IRs wore face shields and hand sanitized frequently to limit large droplet and contact transmission. One transmitted infection was confirmed by serology in a CR, yielding a secondary attack rate of 2.9% among CR, 0% in IR (p = 0.47 for group difference), and 1.3% overall, significantly less than 16% (p<0.001) expected based on a proof-of-concept study secondary attack rate and considering that there were twice as many Donors and days of exposure. The main difference between these studies was mechanical building ventilation in the follow-on study, suggesting a possible role for aerosols.

https://pubmed.ncbi.nlm.nih.gov/32658939