Infection

, Volume 38, Issue 2, pp 117–123

Recent Diarrhea is Associated with Elevated Salivary IgG Responses to Cryptosporidium in Residents of an Eastern Massachusetts Community

  • A. I. Egorov
  • L. M. Montuori Trimble
  • L. Ascolillo
  • H. D. Ward
  • D. A. Levy
  • R. D. Morris
  • E. N. Naumova
  • J. K. Griffiths
Clinical and Epidemiological Study

Abstract

Background:

Serological data suggest that Cryptosporidium infections are common but underreported. The invasiveness of blood sampling limits the application of serology in epidemiological surveillance. We pilot-tested a non-invasive salivary anti-Cryptosporidium antibody assay in a community survey involving children and adults.

Materials and Methods:

Families with children were recruited in a Massachusetts community in July; symptoms data were collected at 3 monthly follow-up mail surveys. One saliva sample per person (n = 349) was collected via mail, with the last survey in October. Samples were analyzed for IgG and IgA responses to a recombinant C. hominis gp15 sporozoite protein using a time-resolved fluorometric immunoassay. Log-transformed assay results were regressed on age using penalized B-splines to account for the strong age-dependence of antibody reactions. Positive responses were defined as fluorescence values above the upper 99% prediction limit.

Results:

Forty-seven (13.5%) individuals had diarrhea without concurrent respiratory symptoms during the 3-month-long follow-up; eight of them had these symptoms during the month prior to saliva sampling. Two individuals had positive IgG responses: an adult who had diarrhea during the prior month and a child who had episodes of diarrhea during each survey month (Fisher’s exact test for an association between diarrhea and IgG response: p = 0.0005 for symptoms during the prior month and p = 0.02 for symptoms during the entire follow-up period). The child also had a positive IgA response, along with two asymptomatic individuals (an association between diarrhea and IgA was not significant).

Conclusion:

These results suggest that the salivary IgG specific to Cryptosporidium antigens warrants further evaluation as a potential indicator of recent infections.

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Copyright information

© Urban & Vogel München 2010

Authors and Affiliations

  • A. I. Egorov
    • 1
    • 2
  • L. M. Montuori Trimble
    • 2
  • L. Ascolillo
    • 2
  • H. D. Ward
    • 2
    • 3
  • D. A. Levy
    • 4
  • R. D. Morris
    • 2
  • E. N. Naumova
    • 2
  • J. K. Griffiths
    • 2
    • 3
    • 5
    • 6
    • 7
  1. 1.National Center for Environmental AssessmentUS Environmental Protection AgencyCincinnatiUSA
  2. 2.Dept. of Public Health and Community MedicineTufts University School of MedicineBostonUSA
  3. 3.Division of Geographic Medicine and Infectious DiseasesDept. of Medicine, Tufts Medical CenterBostonUSA
  4. 4.Centers for Disease Control and PreventionAtlantaUSA
  5. 5.Friedman School of Nutrition Science and PolicyTufts UniversityBostonUSA
  6. 6.Dept. of Civil and Environmental Engineering, School of EngineeringTufts UniversityMedfordUSA
  7. 7.Cummings School of Veterinary MedicineTufts UniversityGraftonUSA

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