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Completed

NCT Number: NCT00342628

Safety, Immunogenicity and Compatibility With DTP of a Typhoid Fever Vaccine in Infants

The purpose of this study is to evaluate the safety, immunogenicity, and compatibility of our Vi-rEPA conjugate administered to infants with their routine vaccinations.

We propose to recruit 300 full term healthy newborns in Vietnam and randomly divide them to receive Vi-rEPA plus DTP, Hib-TT (not yet used in Vietnam) plus DTP, or DTP alone. Consent is obtained following interviews of mothers during prenatal visits, or after delivery. All vaccines will be administered at 2, 4, and 6 months. A booster of Vi-rEPA or Hib-TT conjugate will be administered at 12 months of age and reactions monitored at 6, 24 and 48 hours after each injection. Maternal and cord blood samples are collected during labor and at delivery. Blood will be taken at 7, and 12 months of age from all study infants and at 13 months from infants injected with Vi-rEPA or with Hib-TT at 12 months. The blood samples will be assayed for Vi, Hib, diphtheria, tetanus and pertussis antibodies.

The levels of serum IgG anti-Vi elicited by Vi-rEPA administered to infants by the above schedule will be compared to those elicited by this vaccine in 2 to 5 year-olds in the efficacy trial conducted in Dong Thap Province, Vietnam.

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Key information

Conditions

Typhoid Fever Bacterial Infections Bacterial Infections and Mycoses Enterobacteriaceae Infections Gram-Negative Bacterial Infections Infections Salmonella Infections

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

Primary location

Thanh Thuy District Health Center

Viet Tri, Phu Tho, Vietnam

About this study

Typhoid fever remains common, serious, and difficult-to-treat throughout the world including Vietnam. Limitations of the three licensed typhoid vaccines have prevented their use for routine vaccination of infants. The most recent, Vi polysaccharide typhoid vaccine is useful only in individuals greater than or equal to 5 years of age because of its age-related and T-cell independent properties. The immunogenicity of Vi in individuals less than 5 years-old has been improved by binding it to a protein. In 2 to 4-year-olds, 2 injections of the Vi conjugate induced higher levels of serum IgG anti-Vi than Vi in 5 to 14-year-olds.

A double-blind, placebo controlled and randomized efficacy study in 2 -to-5 years old children in Vietnam showed an over-all efficacy after 27 months of active surveillance followed by 19 months of passive surveillance of 89%. Subsequently a dosage study in the same age group showed the highest antibody levels were induced by the 25 mcg dose.

Now we wish to evaluate the safety, immunogenicity, and compatibility of our Vi-rEPA conjugate administered to infants with their routine vaccinations.

We propose to recruit 300 full term healthy newborns in Vietnam and randomly divide them to receive Vi-rEPA plus DTP (Group A), Hib-TT (not yet used in Vietnam) plus DTP (Group B), or DTP alone (Group C). Maternal and cord blood are taken routinely on all deliveries in Vietnam; these sera will be retrieved for storage when consent is obtained following interviews of mothers during prenatal visits, or after delivery. All vaccines will be administered at 2, 4, and 6 months. A booster of Vi-rEPA or Hib-TT conjugate will be administered at 12 months of age and reactions monitored at 6, 24 and 48 hours after each injection. Blood will be taken at 7, and 12 months of age from all study infants and at 13 months from infants injected with Vi-rEPA or with Hib-TT at 12 months. The blood samples will be assayed for Vi, Hib, diphtheria, tetanus and pertussis antibodies.

The levels of serum IgG anti-Vi elicited by Vi-rEPA administered to infants by the above schedule will be compared to those elicited by this vaccine in 2 to 5 year-olds in the efficacy trial conducted in Dong Thap.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Healthy full-term newborns.
  • Birth weights of >=2500 grams.

Exclusion criteria

  • Newborns without maternal and cord blood samples
  • Newborns born to mothers with serious medical problems.

Treatment and study plan

Vi-rEPA conjugate vaccine for typhoid fever

Biological

Vi-rEPA contains a 25 ug/dose of Vi (Sanofi-Pasteur Lot 130) and rEPA in 0.2 N NaCl, 10 mM phosphate PH 7.2 and 0.01% thimerosal.

Other names: Vi conjugate

Hib-TT

Biological

Hib-TT is Hemophilus influenzae type b-tetanus toxoid conjugate vaccine (ActHib, NDC#49281-545-05 Sanofi-Pasteur, France) in single-dose vials containing 10 ugof Hib CP conjugated to 24 ug of tetanus toxoid

Other names: Hib conjugate

DTP

Biological

DTP, diphtheria, tetanus toxoid and pertussis vaccine were from the Ministry of Health, Vietnam for routine infant immunization

Other names: EPI vaccine

Primary outcomes

  1. Number of Infants With Adverse Reactions After Vaccination

    Time frame: at 2, 4, 6 and 12 months

    Number of infants with Fever>=38.0 C, Induration>=2.5cm at DTP site, Induration>=2.5cm,Vi-rEPA/Hib-TT site, Erythema>=2.5cm, at DTP site, Erythema>=2.5cm, Vi-rEPA/Hib-TT site, Inconsolable crying<4hr, Inconsolable crying>=4hr per injection with Vi conjugate vaccine given in conjunction with DTP in infants.

Secondary outcomes

  1. IgG Anti-Vi Levels

    Time frame: cord sera, infants' sera at 7, 12 and 13 months

    IgG anti-Vi was measured by ELISA and expressed as ELISA units (EU)in all sera.

  2. Antibody Responses to Tetanus Toxoid, Diphtheria Toxoid, and Pertussis Toxin

    Time frame: Cord sera, and infants' sera at 7, 12 and 13 months of age

    IgG anti-diphtheria toxoid (DT), -tetanus toxoid (TT) and -pertussis toxin (PT) were measured by ELISA in sera of 30 randomly chosen infants per group.

  3. Antibody Responses to Hib CP

    Time frame: Cord sera and infant sera at 7, 12, and 13 months

    IgG anti-Hib CP was measured by ELISA in sera of 30 randomly chosen infants per group

Sponsors and collaborators

Lead sponsor

Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)

Nih

Registry information

Official study title

Evaluation of the Safety, Immunogenicity and Compatibility With DTP of an Investigational Vi-rEPA Conjugate Vaccine for Typhoid Fever When Administered to Infants in Vietnam Concurrently With DTP

Important dates

Study start
2006
Primary completion
2008
Study completion
2011
First posted
Jun 21, 2006
Registry last updated
Jun 27, 2012

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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