Vitamin A Supplementation at Birth and Atopy in Childhood
The Effect of Vitamin A Supplementation at Birth on the Development of Atopy in Childhood: Long-term Follow-up of a Randomised Placebo-controlled Trial
INTRODUCTION Eight trials studying the effect of providing neonatal vitamin A supplementation (NVAS) have been reported, and another four are underway to test whether NVAS should become WHO policy. Three of the four African trials were conducted by the Bandim Health Project (BHP) in Guinea-Bissau. One of them was a two-by-two factorial trial among low-birth-weight children. From 2004-2008, the children were randomly allocated to 25,000 IU vitamin A or placebo at birth, and furthermore to BCG vaccination at birth or later as is local policy. In 2011, the investigators conducted a follow-up study. A remarkably strong harmful effect of NVAS on atopy and wheezing was found (manuscript under review).
Seen in the context that NVAS may soon become a WHO policy it is obviously worrying if NVAS is associated with a higher risk of atopy and wheezing. The investigators therefore aim to conduct a similar follow-up study of participants in the first NVAS trial conducted in Guinea-Bissau from 2002-2004, among normal-birth-weight infants, to test whether NVAS is associated with an increased risk of atopy and wheezing and other allergic symptoms as well as growth.
METHODS
Study population:
From 2002-2004 BHP conducted a randomised trial of NVAS. The investigators recruited newborns when they came for BCG vaccination. Provided parental consent, they received an oral supplement of 50,000 IU vitamin A or placebo.
Study design:
This study will be a follow-up study of the cohort of children randomised to NVAS (intervention) or placebo (current policy) together with BCG vaccine at birth.
Other exposures:
The investigators will also investigate the effect of receiving an additional dose of measles vaccine and the timing of DTP vaccine on the development of atopy.
Assessment of outcomes:
The investigators will visit all children at the last known address. Height, weight and mid upper arm circumference will be measured. BCG scar will be examined and vaccination card details recorded by the field assistant. Children will be excluded from skin prick testing (SPT) if they have a history suggestive of anaphylaxis or are currently using anti-histamine medication. SPT will be performed using aero-allergens, food allergens and positive histamine and negative saline control. The mother or guardian will be interviewed by a local assistant. Symptoms of eczema and asthma as well as food allergy will be assessed.
Statistical analysis:
Effect of randomisation group and other factors on outcomes will be analysed in multivariable regression models. All analyses will be adjusted for skin prick tester. All analyses will be conducted stratified by sex.
Studienübersicht
Status
Status
Bedingungen
Bedingungen
Studientyp
Studientyp
Einschreibung (Voraussichtlich)
Einschreibung
Kontakte und Standorte
Studienorte
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Bissau Codex
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Bissau, Bissau Codex, Guinea-Bissau, 1004
- Bandim Health Project
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Teilnahmekriterien
Zulassungskriterien
Zulassungskriterien
Studienberechtigtes Alter
Akzeptiert gesunde Freiwillige
Studienberechtigte Geschlechter
Probenahmeverfahren
Studienpopulation
Beschreibung
Inclusion Criteria:
- Enrolled at birth in NCT00168610
Exclusion Criteria:
- Children with history suggestive of anaphylaxis will be excluded from skin prick testing but included in the study population
Studienplan
Wie ist die Studie aufgebaut?
Designdetails
Was misst die Studie?
Primäre Ergebnismessungen
Primäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
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Atopic sensitisation
Zeitfenster: Single observation on day of recruitment
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Skin prick test positivity.
A wheal >=3mm will be considered positive.
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Single observation on day of recruitment
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Sekundäre Ergebnismessungen
Sekundäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
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Symptoms of asthma
Zeitfenster: Single observation on day of recruitment
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Questionnaire based on ISAAC survey for 6-7 year olds
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Single observation on day of recruitment
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Symptoms of eczema
Zeitfenster: Single observation on day of recruitment
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Questionnaire based on ISAAC survey for 6-7 year olds
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Single observation on day of recruitment
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Symptoms of food allergy
Zeitfenster: Single observation of day of recruitment
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Questionnaire based on Health Nuts survey
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Single observation of day of recruitment
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Andere Ergebnismessungen
Andere Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
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Weight
Zeitfenster: Single observation on day of recruitment
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Single observation on day of recruitment
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Height
Zeitfenster: Single observation on day of recruitment
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Single observation on day of recruitment
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Mid-upper arm circumference
Zeitfenster: Single observation on day of recruitment
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Single observation on day of recruitment
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Hospitalisations
Zeitfenster: Single observation on day of recruitment
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Single observation on day of recruitment
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Infectious diseases
Zeitfenster: Single observation on day of recruitment
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History of chickenpox or measles
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Single observation on day of recruitment
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Mitarbeiter und Ermittler
Sponsor
Sponsor
Ermittler
Ermittler
- Hauptermittler: Christine Benn, DMSc, Statens Serum Institut
Publikationen und hilfreiche Links
Studienaufzeichnungsdaten
Haupttermine studieren
Studienbeginn
Studienbeginn
Primärer Abschluss (Tatsächlich)
Primärer Abschluss
Studienabschluss (Voraussichtlich)
Studienabschluss
Studienanmeldedaten
Zuerst eingereicht
Zuerst eingereicht
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst gepostet (Schätzen)
Zuerst gepostet
Studienaufzeichnungsaktualisierungen
Letztes Update gepostet (Schätzen)
Letztes Update gepostet
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Zuletzt verifiziert
Zuletzt verifiziert
Mehr Informationen
Begriffe im Zusammenhang mit dieser Studie
Schlüsselwörter
Zusätzliche relevante MeSH-Bedingungen
Andere Studien-ID-Nummern
Andere Studien-ID-Nummern
- 2013-VAS-Atopy
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