Case 164. Reference case 164A

　 　 　 　
　 Ziehl-Neelsen stain reveals numerous acid-fast bacilli in the cytoplasm of foamy histiocytes. 　
　 　 　 　

　

 　 This type of non-tuberculous mycobacteriosis tends to be clustered within a family. M. avium can grow in 42℃ water, and the 24-hour bath system can be equipped in the house. This is the reason why the incidence of cutaneous M. avium infection is increasing in Japan.