Ismail, Zuhair B, et al. “Seroprevalence and Risk Factors of Leptospira Serovar Pomona and Leptospira Serovar Hardjo Infection in Dairy Cows in Jordan”. The Journal of Infection in Developing Countries, vol. 13, no. 06, June 2019, pp. 473-9, doi:10.3855/jidc.11146.