Effect of Meningococcal Conjugate Vaccine on Meningococcal Carriage

March 16, 2007 updated by: Centers for Disease Control and Prevention

Evaluation of the Effect of Tetravalent (A, C, Y, W-135) Meningococcal Conjugate Vaccine on Serogroup-Specific Carriage of Neisseria Meningitidis

The purpose of this study is to determine whether the new meningococcal conjugate vaccine (MCV4) can reduce asymptomatic carriage of meningococcal bacteria, and thus decrease the transmission of these bacteria in the population.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The purpose of this study is to determine whether the new meningococcal conjugate vaccine (MCV4) can reduce asymptomatic carriage of meningococcal bacteria, and thus decrease the transmission of these bacteria in the population.

Neisseria meningitidis is a leading cause of bacterial meningitis in the United States. A new tetravalent (A, C, Y, W-135) meningococcal conjugate vaccine ([MCV4], MenactraTM manufactured by Sanofi Pasteur Inc.) has been approved by Food and Drug Administration (FDA) in January 2005. This vaccine is recommended by ACIP for routine vaccination of young adolescents at the pre-adolescent visit (11-12 years old), adolescents at high school entry (15 years old), and college freshmen living in dormitories. Prevention of asymptomatic nasopharyngeal carriage of meningococci is important to interrupt person-to-person transmission and to induce herd immunity, when lower transmission results in lower disease rates among those people who are not vaccinated. No studies have yet been done to evaluate the impact of this new vaccine on carriage.

This is a randomized study designed to evaluate the effect of MCV4 on meningococcal carriage. Several high schools will be randomized into the intervention and control groups. Students in intervention group will receive MCV4 at the beginning of the study, students in the control group will be offered MCV4 after the study completion. Three specimens of throat secretions (similar to swabs for Strep throat) will be collected from the students enrolled in the study: before vaccination of intervention group students (at the start of the school year), 8 weeks post-vaccination, and 9 months post-vaccination (at the end of the school year). Questionnaire administered at the time of swabbing will assess potential risk factors for meningococcal carriage. Meningococcal bacteria isolated from the throat specimens will be serogrouped and molecularly typed. Approximately 2,000 students in each group will be needed for the study. Anticipating 35% refusal rate and 25% loss to follow-up, approximately 4,200 high school students will need to be approached in each group.

This study will answer an important question whether those who are vaccinated are protected not only from disease, but also from being asymptomatic carriers of meningococci. If so, those who are vaccinated will not be able to carry and transmit bacteria to unvaccinated individuals. Meningococcal conjugate vaccines may become available in the near future to other age groups, including infants and children. Determining the efficacy of MCV4 against meningococcal carriage will be important for policy decisions regarding vaccination with this and future conjugate vaccines in different age groups.

Study Type

Interventional

Enrollment

4000

Phase

  • Phase 4

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • High school students (grades 9-12) enrolled in participating schools

Exclusion Criteria:

  • Contraindications to vaccine administration

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
The prevalence of asymptomatic nasopharyngeal carriage of meningococci serogroup Y in vaccinated and unvaccinated individuals

Secondary Outcome Measures

Outcome Measure
The overall prevalence of asymptomatic nasopharyngeal carriage of meningococci in vaccinated and unvaccinated individuals
the baseline prevalence of asymptomatic nasopharyngeal carriage of meningococci

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Centers for Disease Control and Prevention

Collaborators

Johns Hopkins University
University of Pittsburgh
Maryland Department of Health and Mental Hygiene
Georgia Department of Human Resources

Investigators

  • Principal Investigator: Eric Stern, MD, Centers for Disease Control and Prevention

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

August 1, 2006

Study Completion

May 1, 2007

Study Registration Dates

First Submitted

July 7, 2005

First Submitted That Met QC Criteria

July 11, 2005

First Posted (Estimate)

July 13, 2005

Study Record Updates

Last Update Posted (Estimate)

March 19, 2007

Last Update Submitted That Met QC Criteria

March 16, 2007

Last Verified

March 1, 2007

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • CDC-NCID-4591

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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