Received: 15 February 2018
Accepted: 21 June 2018
First Online: 6 July 2018
Ethics approval and consent to participate
: Study was approved by Institutional Review Board of Aklilu Lemma Institute of Pathobiology, Addis Ababa University and oral consent was obtained from the farm owners before sampling.
: Not applicable.
: The author declares that he has no competing interests.
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