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Cryptosporidiosis - Cryptosporidium Life Cycle 1) Thick-walled oocyst (sporulated) exits host 2) Contamination of water and food with oocysts. 3) Thick-walled oocyst ingested by host Cattle are major hosts for C. parvum. #Cryptosporidiosis #Cryptosporidium #LifeCycle #diagnosis #pathophysiology #infectiousdiseases #cdc #parasite