Answer: Cryptosporidium
Explanation:
Cryptosporidium is referred to as the microscopic and imperceptible parasite which tends to causes diarrheal disease known as the cryptosporidiosis. Most of the times the parasite cryptosporidium and the disease cryptosporidiosis are commonly referred to as Crypto. There are known to be several species of the parasite cryptosporidium which tends to infect cattle, some of them further infect the humans.
