The germ Cryptosporidium, in short Crypto, causes this parasitic disease. This infection is commonly spread accidentally, swallowing stools of infected animals or people. 

How it spreads : Crypto spreads through swallowing poop that contains germs or through contaminated food. For instance, if somebody drinks untreated water from ponds or canals, recreational water, or doesn't wash their hands after handling an infected animal, they can get Crypto.
 
Who is at risk : Crypto can affect anyone, particularly those people with weak immune systems or already suffering from severe diseases. 

Signs in Dogs : Dogs are at a lower risk of getting infected with Crypto. Moreover, in the case of getting an infection, dogs may not show any particular symptoms of illness or sometimes may have watery diarrhea.

Symptoms in people : Infected people may show watery diarrhea with cramping, profuse vomiting, nausea, and abdominal pain. The symptoms usually disappear typically within 1–2 weeks.

Diagnosis & Detection : Cryptosporidiosis is diagnosed after examining the stool samples. However, the detection of Crypto isn't as easy as it may seem. People may have to submit stool samples over several days. Additionally, the stool is examined using different techniques such as; acid-fast staining, enzyme immunoassays, or direct fluorescent antibody [DFA].