Received: 6 March 2020
Accepted: 4 August 2020
First Online: 24 August 2020
Ethics approval and consent to participate
: According to the rules of the Ethical Committee for Animal Experiments at Mansoura University (Mansoura, Egypt), a research protocol must be reviewed by the committee when experiments on animals are conducted in a study. In this study, no experiments on animals were conducted. While collecting the dust samples from laying hen houses, animals were not touched or affected adversely by the sampling method. Prior to the collection of dust samples, farm owners gave informed verbal approval to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.