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Virulence of Three Distinct Cryptospovidium parvum Isolates for Healthy Adults

Virulence of Three Distinct Cryptospovidium parvum Isolates for Healthy Adults The infectivity of three Cryptosporidium parvum isolates (Iowa [calf], UCP [calf], and TAMU [horse]) of the C genotype was investigated in healthy adults. After exposure, volunteers recorded the number and form of stools passed and symptoms experienced. Oocyst excretion was assessed by immunofluorescence. The ID50 differed among isolates: Iowa, 87 (SE, 19; 95% confidence interval [CI], 48.67–126); UCP, 1042 (SE, 1000; 95% CI, 0–3004); and TAMU, 9 oocysts (SE, 2.34; 95% CI, 4.46–13.65); TAMU versus Iowa, P = .002 or UCP, P = .019. Isolates also differed significantly (P = .045) in attack rate between TAMU (86%) and Iowa (52%) or UCP (59%). A trend toward a longer duration of diarrhea was seen for the TAMU (94.5 h) versus UCP (81.6 h) and Iowa (64.2 h) isolates. C. parvum isolates of the C genotype differ in their infectivity for humans. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Infectious Diseases Oxford University Press

Virulence of Three Distinct Cryptospovidium parvum Isolates for Healthy Adults

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References (46)

Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
Subject
Major Articles
ISSN
0022-1899
eISSN
1537-6613
DOI
10.1086/315033
pmid
10479158
Publisher site
See Article on Publisher Site

Abstract

The infectivity of three Cryptosporidium parvum isolates (Iowa [calf], UCP [calf], and TAMU [horse]) of the C genotype was investigated in healthy adults. After exposure, volunteers recorded the number and form of stools passed and symptoms experienced. Oocyst excretion was assessed by immunofluorescence. The ID50 differed among isolates: Iowa, 87 (SE, 19; 95% confidence interval [CI], 48.67–126); UCP, 1042 (SE, 1000; 95% CI, 0–3004); and TAMU, 9 oocysts (SE, 2.34; 95% CI, 4.46–13.65); TAMU versus Iowa, P = .002 or UCP, P = .019. Isolates also differed significantly (P = .045) in attack rate between TAMU (86%) and Iowa (52%) or UCP (59%). A trend toward a longer duration of diarrhea was seen for the TAMU (94.5 h) versus UCP (81.6 h) and Iowa (64.2 h) isolates. C. parvum isolates of the C genotype differ in their infectivity for humans.

Journal

Journal of Infectious DiseasesOxford University Press

Published: Oct 1, 1999

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