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Volume 28, Number 7—July 2022
Dispatch

Highly Pathogenic Avian Influenza A(H5N8) Clade 2.3.4.4b Virus in Dust Samples from Poultry Farms, France, 2021

Fabien Filaire, Laetitia Lebre, Charlotte Foret-Lucas, Timothée Vergne, Patrick Daniel, Aurélie Lelièvre, Antoine de Barros, Adam Jbenyeni, Pierrick Bolon, Mathilde Paul, Guillaume Croville, and Jean-Luc Guérin
Author affiliations: THESEO France, Laval, France (F. Filaire); Université de Toulouse, Toulouse, France (F. Filaire, L. Lebre, C. Foret-Lucas, T. Vergne, A. De Barros, A. Jbenyeni, P. Bolon, M. Paul, G. Croville, J.-L. Guérin); Laboratoires des Pyrénées et des Landes, Mont-de-Marsan, France (P. Daniel); SOCSA 40, Amou, France (A. Lelièvre)

Main Article

Table 2

Viral isolation assays on chicken embryonated eggs performed on 5 of the 63 poultry houses in a study to detect highly pathogenic avian influenza A(H5N8) virus on poultry farms, France, December 2020–April 2021*

Sample type† House 11
 House 26
 House 29
 House 30
 House 34
Ct VI Ct VI Ct VI Ct VI Ct VI
Tracheal swab 25 + 20.7 + 21.9 + 18.9 + 20 +
Dust wipe, feeders 25.8 – 25.1 – 27.4 + 29.5 + 24.2 +
Dust wipe, walls 27.5 + 25.5 – 30.1 + 28.3 + 23 +
Coriolis
 32
 –
33.6
 –
27.8
 –
25.8
 +
26.9
 +
NIOSH BC251
Fraction 1 34 – 33.6 – 27.8 – 25.8 + 23.7 +
Fraction 2 – ND 36 – 32.4 – 33.1 – 18.6 +
Fraction 3 – ND – ND 36.3 – – ND – ND

*Ct, cycle threshold; ND, not done; VI, virus isolation; +, positive; –, negative. †Each farm or building was sampled by using 4 pools of 5 tracheal swab samples, 2 wipe samples (1 from feeders, 1 from walls), and on 19 farms, 1 air sample from each of the 2 aerosol collection devices, the Coriolis Compact (Bertin Instruments, https://www.bertin-instruments.com) and the NIOSH BC 251, developed by the National Institute for Occupational Safety and Health (https://www.cdc.gov/niosh). NIOSH BC 251 sampling device has 3 fractions for different particle sizes; fraction 1 for >4 µm, fraction 2 for 1–4 µm, and fraction 3 for <1 µm.

Main Article

Page created: May 03, 2022
Page updated: June 18, 2022
Page reviewed: June 18, 2022
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