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Campylobacter Jejuni Challenge Model Development: Assessment of Homologous Protection

2014-08-27 03:16:41 | BioPortfolio

Summary

The goal of this research is to continue to develop a model of infection with Campylobacter jejuni, a bacterium that causes food and water-borne disease (mainly diarrhea). The objectives are to 1) determine if healthy subjects develop short-term (<6 month) protection to reinfection with C. jejuni; and 2) characterize the immune responses to C. jejuni infection. Information obtained will be used in development of a vaccine against Campylobacter infections.

Volunteers will be screened for eligibility within 60 days prior to enrollment. Screening will include obtaining informed consent prior to any study procedure. This will be followed by medical history, physical examination, review of current medications, blood samples for safety labs (WBC, Hct, Hgb, platelet count; chemistry panel; screening for HIV, HLA-B27, HBV, and HCV); urine pregnancy testing for females. Stool will be tested for infection.

Eligible volunteers will be enrolled in the study and admitted to the GCRC on Day -1. They will drink a measured dose of C. jejuni on Day 0, and followed for approximately 9 inpatient days, during which time the investigators expect at least 75% to develop a diarrheal illness, which will be promptly treated with replacement fluids (oral or IV, as indicated) and antibiotics. During the inpatient period, subjects will be assessed for any adverse events, and blood and stool specimens will be analyzed for markers of infection and markers of immune response. Subjects must have resolved or resolving symptoms and two negative stool cultures ≥12 hours apart to be eligible for discharge, and will be seen in outpatient follow-up at 21, 28, 35, 60, and 90 days for additional AE assessments and blood and stool analysis.

Eight subjects will return for redosing approximately 98 days after the initial dose, with the same inpatient and outpatient follow-up as above. Few or none should develop a diarrheal illness. Four naïve (previously unexposed) subjects will also receive the dose on Day 98 to confirm a 75% illness rate with this dose. They will be followed as the initial group was. All participants will be assessed by phone 6 months after the final dose they received.

Study Design

Allocation: Non-Randomized, Control: Uncontrolled, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Prevention

Conditions

Campylobacter Infections

Intervention

Campylobacter jejuni strain CG8421

Location

Navy Medical Research Center
Silver Spring
Maryland
United States
20910

Status

Recruiting

Source

University of Vermont

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-08-27T03:16:41-0400

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A species of CAMPYLOBACTER isolated from cases of human PERIODONTITIS. It is a microaerophile, capable of respiring with OXYGEN.

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