Case 19. Reference case 19B

　 　 　 　
　
Opportunistic cryptosporidiosis in a Japanese AIDS patient
 　
　 　 　 　

　

 　 Small pathogens in the brush border are identified by a 1:500 diluted serum of a healthy individual who suffered and recovered from acute, self-limiting cryptosporidiosis (indirect immunoperoxidase staining)