UNIVERSITE SAINT-ESPRIT DE KASLIK
FACULTE DE MEDECINE
EFFET DE LA VITAMINE D CHEZ LES ENFANTS VACCINES CONTRE LA GRIPPE
These en vue d' obtention d 'un doctorat en medecine
Preparee par Christelle T A YEH
Sous la direction de
Dr M.C.F ADOUS KHALIFEKaslik-Liban 2014
Soutenu le 29 Mars 2014 devant le jury compose de Dr M.C.Fadous Khalifeh
Dr Peter Noun Dr Georges Nicolas Dr Georges Abi Fares Dr Antoine Farah Dr Femia Hayek
Directeur President Rapporteur Membre Membre Membre
TABLE DES MATIERES
Table des matieres ... 1
Resume ... 3
Abstract ... 4
Introduction et problematique ... 5
Revue de la litterature ... 6
1. La vitamine D ... 6
1.1. Historique ... 6
1.2. Metabolisme de la vitamine D ... 7
1.3. Le statut vitaminique ... 11
1.4. Toxicite et dosage de la vitamine D ... 13
1.5. Effet classique de la vitamine D ... 13
1.6. Effets non classiques de la vitamine D ... 15
1. 7. Recommandations ... 20
2. La grippe et le vaccin antigrippal.. ... 21
2.1. His tori que ... 21
2.2. Le virus ... 21
2.3. Tableau clinique ... 24
2.4. La morbidite et la mortalite ... 26
2. 5. Importance du vaccin ... 26
2.6. Mecanisme d'action ... 28
2. 7. Les recommandations ... 28
Page
11
2.8. Lavoie d'administration ... 29
2.9. Effets secondaires et associations ... 30
Materiels et methodes ... 31
Resultats ... 34
1. Introduction aux resultats ... 34
2. Infections respiratoires hautes ... 34
3. Infections respiratoires basses ... 35
4. En fonction du type de vaccination ... 36
Discussion ... 37
Conclusion et perspectives ... 41
References des figures ... 42
Liste des tableaux ... 43
Liste des abreviations et des synonymes ... 53
Bibliographie ... 54
RESUME
Introduction:
La grippe represente l'un des problemes majeurs en pediatrie. L'un des plus recents effets decrits concernant la vitamine D est son action immunitaire. Le but de notre etude est de comparer 1' effet du vaccin antigrippal ou du vaccin antigrippal couple a une dose de charge de vitamine D (100000 Unites International- UI per os) sur le nombre d'infections ORL (Oto-Rhino- laryngologiques) ou respiratoires durant la saison hivernale.
Materiels et methodes:
347 enfants en bonne sante ages entre 2 et 5 ans ont ete selectionnes de differentes regions du Liban randomises sur 2 saisons : hiver 2011-2013 et 2013-2014. Les differentes infections respiratoires superieures et inferieures ont ete notees. Les resultats ont ete etudies grace au programme statistique SPSS.
Resultats:
Sur un total de 347 enfants inclus, 150 ont re9u le vaccin de 1a grippe isole et 197 ont re9u le vaccin avec une dose de charge unique de 1 00000 UI de vitamine D. L 'etude statistique a ete non significative pour les infections respiratoires hautes
(p=0,207)et a revele une difference significative entre les 2 groupes pour les infections respiratoires basses
(p=O,OOJ).Conclusion :
Le vaccin de la grippe couple a une dose de charge de vitamine D est inefficace pour la protection des infections de la sphere ORL mais represente une strategie de prevention des infections respiratoires basses dans la population pediatrique.
Mots-des: Grippe, vaccin, vitamine D, infection respiratoire haute et basse.
Page
13
ABSTRACT
Introduction:
Influenza disease is one of the major health concerns in pediatrics. One of the most recently suggested effects of vitamin D is preventing infectious diseases. The aim of our study was to compare flu vaccine effect to flu vaccine associated to vitamin D (100000UI per os) in reducing respiratory tract infections in children.
Patients and Methods:
347 healthy children aged 2 to 5 years randomly selected from different regions in Lebanon between September-October 2012 and the following season between September and October 2013 were included; Upper and lower respiratory tract infections following vaccination were noted. Our results were analyzed using SPSS program (Chi-square and t-test).
Results:
Out of a total of 347 children included, 150 received flu vaccine and 197 received flu vaccine plus vitamin D. Eighty-eight children from both groups manifested upper respiratory tract infections and sixty-four had lower respiratory tract infections. The statistical analysis revealed no significant difference between the two groups concerning the upper respiratory infection (p=0.207) and a significant difference between groups for the lower respiratory tract infection (p=O.OOJ).
Conclusion:
Coupling vitamin D to flu vaccine provides no protection against upper respiratory infections but provides an effective strategy to decrease the rate of lower respiratory infections in children 2-5 years of age.
Key words: Influenza, flu vaccine, vitamin D, upper and lower respiratory tract infection.
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