Received: 23 September 2019
Accepted: 7 January 2020
First Online: 22 January 2020
Ethics approval and consent to participate
: This study was conducted after gaining full approval by the Institutional Review Board (AAU-IRB) of the Colleges of Health Sciences, Addis Ababa University, Ethiopia and The Ethiopian National Research Ethics Review Committee (NERC). Written informed consent was obtained from each study participant. Also, permission from dairy farm owners/managers was obtained before collection of milk samples.
: Not applicable.
: The authors declare that they have no competing interests.