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. 2017 Nov;23(11):1806–1814. doi: 10.3201/eid2311.170672

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Processing area for study of airborne transmission of highly pathogenic influenza virus during processing of infected poultry. The star represents the location of the air sampler (experiment 1) or the naive hosts (experiment 2). The arrows indicate the airflow within the HEPA enclosure. The enclosure was 1.5 m wide × 6.7 m long × 2.1 m high, with 8.3 air changes/h (340 m³/h) and a velocity of 0.046 m/s.