Spread from infected cows by equipment, hands, washing & insects 公眾衛生：造成擠奶員手或指上紅色/紫色發癢的結節 Public Health: Causes mild itchy purple/red nodules on hands and fingers of milker
危險因素
Risk Factors
僅僅新產牛最易感
Just freshened cows are most susceptible
臨床癥狀
Clinical Findings
乳頭/乳房上紅小色丘疹，逐漸發展為水皰，最后結痂
Small red papules on teats and udder progressing to vesicles then scabs
馬蹄形或圓環形痂
Horseshoe or circular ring of scabs
一般3周內治愈，但可持續數月Usually heal in 3 weeks but may persist for months
診斷
Diagnosis
特征性馬蹄形或圓環形痂
Characteristic horseshoe or circular ring of scabs
鑒別診斷
Differential Diagnosis
牛創傷性乳頭炎
Bovine ulcerative mammillitis
疣
Warts
外傷性損傷
Traumatic injury
牛痘—少見
Cowpox -rare
治療
Treatment
擠奶前涂藥膏
Ointment before milking
碘附浸泡奶頭
Iodophors teat dip
預后情況
Prognosis
良好，乳腺炎發病率增加
Good although increased incidence of mastitis