True about Cryptosporidium are all EXCEPT:
ANSWER: (C) Spores > 100 micro metersREF: Harrison s 18tK ed ch: 215Cryptosporidiosis is acquired by the consumption of oocystsSporozoites infect intestinal cellsparvum can spread from infected animals to humans. Since oocysts are immediately infectious when passed in feces, person-to-person transmission takes place in day-care centers and among household contacts and medical providers.Waterborne transmission (especially that of C. hominis) accounts for infections in travelers and for common- source epidemics.Oocysts are quite hardy and resist killing by routine chlorination. Both drinking water and recreational water (e.g., pools, waterslides) have been increasingly recognized as sources of infection.Clinical features:[?] Asymptomatic infections can occur in both immunocompetent and immunocompromised hosts.[?] In immunocompetent persons, symptoms develop after an incubation period of 1 week and consist principally of watery nonbloody diarrhea, sometimes in conjunction with abdominal pain, nausea, anorexia, fever, and./ or weight loss. In these hosts, the illness usually subsides after 1-2 weeks.[?] In contrast, in immunocompromised hosts (especially those with AIDS and CD4+ T cell counts <100/L), diarrhea can be chronic, persistent, and remarkably profuse, causing clinically significant fluid and electrolyte depletionDiagnosis:[?] Evaluation starts with fecal examination for small oocysts, which are smaller (4-5 micro meter in diameter) than the fecal stages of most other parasites.[?] Spores are acid fast.[?]Direct immunofluorescent stains and enzyme immunoassays can be done.[?] Cryptosporidia can also be identified by light and electron microscopy at the apical surfaces of intestinal epithelium from biopsy specimens of the small bowel and, less frequently, the large bowel.
Spores chlorine resistant
Add fast spores
Spores > 100 micro meters
Enzyme immune assay done
Parasitology