cryptosporidiosis, a diarrheal disease caused by cryptosporidium parvum protozoan

agent anatomical anatomy causative cryptosporidia cryptosporidiosis cryptosporidium cyst diarrhea diarrheal disease human ileum illness illustration infection infective intestine jejunum microbe microbiology microorganism microscopic oocyst parasite parasitic parvum pathogen pathology protozoa protozoan release science scientific small sporozoite