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Maternal immunization with tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis vaccine (Tdap) is a potential strategy to protect young infants against pertussis before they are fully vaccinated because maternal antibodies may cross the placenta and passively protect her infant. The proposed study is a randomized, blinded, controlled, vaccine trial of maternal Tdap vaccination during the third trimester of pregnancy (Tdap vaccination at 27-36 weeks gestation). Pregnant women will be recruited from prenatal care facilities in participating municipalities of the Quetzaltenango and Santa Rosa regions (departamentos) of Guatemala. Enrolled women and their infants will be followed up until 7 months post-partum.
The proposed study is a randomized, blinded, controlled, vaccine trial of maternal Tdap vaccination during the third trimester of pregnancy (Tdap vaccination at 27-36 weeks gestation). Pregnant women will be recruited from prenatal care facilities in participating municipalities of the Quetzaltenango and Santa Rosa regions (departamentos) of Guatemala.
All healthy pregnant women between the ages of 18 and 40 years (inclusive) at 27 weeks gestation or later who are in the study areas will be eligible to participate in this study unless they meet one or more of the exclusion criteria. Pregnant women at <27 weeks gestation will be pre-screened and provided information about the study to encourage them to enroll later in their pregnancy. Women who are eligible will be enrolled after obtaining informed consent, and then they will be randomized to receive Tdap vaccine or Td vaccine. Enrolled women and their infants will be followed up until 7 months postpartum.
To address the primary objective, serum specimens will be collected from mothers prior to receiving the study product (Tdap or Td), within 72 hours after delivery and at 7 months post-partum. Moreover, infants specimens will be collected at delivery (cord blood or infant blood within 72 hours of birth), at 2 months of age (prior to the first dose of the routine childhood DTwP series), and at 7 months of age (approximately 4 weeks after the third dose of the routine DTwP series).
Infants will be given all three doses of DTwP vaccine at 2, 4 and 6 months (routine childhood immunizations) as recommended by the immunization schedule of Guatemala's National Immunization Program.
Adverse events and serious adverse events will also be monitored.
Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Investigator), Primary Purpose: Prevention
Universidad del Valle de Guatemala
Not yet recruiting
Published on BioPortfolio: 2015-03-03T00:08:22-0500
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A suspension of killed Bordetella pertussis organisms, used for immunization against pertussis (WHOOPING COUGH). It is generally used in a mixture with diphtheria and tetanus toxoids (DTP). There is an acellular pertussis vaccine prepared from the purified antigenic components of Bordetella pertussis, which causes fewer adverse reactions than whole-cell vaccine and, like the whole-cell vaccine, is generally used in a mixture with diphtheria and tetanus toxoids. (From Dorland, 28th ed)
One of the virulence factors produced by BORDETELLA PERTUSSIS. It is a multimeric protein composed of five subunits S1 - S5. S1 contains mono ADPribose transferase activity.
Combined vaccines consisting of DIPHTHERIA TOXOID; TETANUS TOXOID; and an acellular form of PERTUSSIS VACCINE. At least five different purified antigens of B. pertussis have been used in various combinations in these vaccines.
A combined vaccine used to prevent infection with diphtheria and tetanus toxoid. This is used in place of DTP vaccine (DIPHTHERIA-TETANUS-PERTUSSIS VACCINE) when PERTUSSIS VACCINE is contraindicated.
A vaccine consisting of DIPHTHERIA TOXOID; TETANUS TOXOID; and whole-cell PERTUSSIS VACCINE. The vaccine protects against diphtheria, tetanus, and whooping cough.
A vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism, and is often made from weakened or killed forms of the microbe, its toxins or one ...