Revaccination of Young Children With Bacille Calmette Guerin (BCG) Vaccine
Summary
BCG has marked immune stimulatory effects in both animal and human studies and observational studies suggest that BCG is associated with a non-specific reduction in mortality in areas with high infant and child mortality. The specific objective of the study is to examine the effect of revaccination for purified protein derivative of tuberculin (PPD) reaction, scar size, morbidity and mortality in a randomised prospective study of revaccination versus no revaccination among children 19 months of age in Guinea-Bissau. The hypothesis is that revaccination with BCG reduces childhood mortality after 19 months of age by 30%.
Description
Examine in a randomised trial whether revaccination with BCG reduces childhood mortality after 19 months of age by 30%.
Criteria for verification: 3,000 children aged 1½ year enrolled and followed for an average of 3 years; information on potential adverse events among children with a positive PPD reaction; assessment of parasitaemia after revaccination; assessment of the tuberculin response and scar-formation after revaccination; and assessment of all-cause mortality during the period of follow-up.
Following consent to participate, children will be assessed for BCG scar and tuberculin reaction at 18-19 months of age. Subsequently, the children will be invited to a clinical examination at one of the health centres. The study will be explained again to the mother, and if she accepts to participate, she will draw a randomisation number deciding whether the child will be revaccinated or not. The BCG vaccine given will be the standard dose of 0.1 ml as recommended by WHO in this age group. In the beginning of the study, a group of 800 revaccinated and not revaccinated children will be followed weekly for two months to monitor morbidity and possible adverse effects of the vaccination. It is not expected that Koch like reactions will be common in this age group. However, should there be too many adverse reactions among children with a positive tuberculin test, only tuberculin negative children will be included in the continuation of the trial.
Two months after inclusion, the children will have another tuberculin test to examine changes in tuberculin reaction. At the same time, scar-size will be measured. In the initial phase of the project, a finger-prick blood sample will be collected from 1000 children to examine whether BCG boosting/no boosting have had an effect on the prevalence of malaria parasitaemia and the level of measles antibodies. Children with malaria will be treated and children with non-protective levels of measles antibodies will be offered revaccination with measles vaccine. In a group of children, samples will be collected both before and after BCG revaccination/no revaccination to measure changes in cytokine profile. Children with a large PPD reaction (> 15mm) will be followed in a similar way as the other children as this may reflect immune stimulation from exposure to natural TB. The studies of morbidity and immunological changes will be done both in the dry and the rainy seasons. The children will be followed for hospitalisations and mortality to 5 years of age.
Study Design
Allocation: Randomized, Control: Placebo Control, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Prevention
Conditions
Malaria
Intervention
Bacille Calmette Guerin (BCG)
Location
Bandim Health Project
Apartado 861, Bissau
Guinea-Bissau
Status
Terminated
Source
Bandim Health Project
Results (where available)
Links
- Source: http://clinicaltrials.gov/show/NCT00126217
- Information obtained from ClinicalTrials.gov on July 15, 2010
Medical and Biotech [MESH] Definitions
Malaria, Vivax
Malaria caused by PLASMODIUM VIVAX. This form of malaria is less severe than MALARIA, FALCIPARUM, but there is a higher probability for relapses to occur. Febrile paroxysms often occur every other day.
Malaria Vaccines
Vaccines made from antigens arising from any of the four strains of Plasmodium which cause malaria in humans, or from P. berghei which causes malaria in rodents.
Plasmodium Vivax
A protozoan parasite that causes vivax malaria (MALARIA, VIVAX). This species is found almost everywhere malaria is endemic and is the only one that has a range extending into the temperate regions.
Malaria, Falciparum
Malaria caused by PLASMODIUM FALCIPARUM. This is the severest form of malaria and is associated with the highest levels of parasites in the blood. This disease is characterized by irregularly recurring febrile paroxysms that in extreme cases occur with acute cerebral, renal, or gastrointestinal manifestations.
Plasmodium Cynomolgi
A protozoan parasite that occurs naturally in the macaque. It is similar to PLASMODIUM VIVAX and produces a type of malaria similar to vivax malaria (MALARIA, VIVAX). This species has been found to give rise to both natural and experimental human infections.
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