C. burnetii is mainly shed during and after parturition or abortion in birth products but shedding also occurs in urine,faeces, vaginal mucus and milk (Van den Brom et al., 2013). Humans are usually infected by inhalation of aerosol and dust containing C. burnetii in a contaminated environment. Unpasteurized milk or milk products may contain virulent C. burnetii and Q fever can be transmitted through consumption of these products (Khalili et al., 2015).