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  1. Decreased point prevalence of Haemophilus influenzae type b (Hib) oropharyngeal colonization by mass immunization of brazilian children less than 5 years old with Hib polyribosylribitol phosphate polysaccharide-tetanus toxoid conjugate vaccine in combination with diphtheria-tetanus toxoids-pertussis vaccine.

    Article - En anglais

    A protective herd effect has been described after susceptible populations of children are vaccinated with conjugate Haemophilus influenzae type b (Hib).

    Hib carriage was studied in children aged 6-24 months attending day care centers in two cities in southern Brazil (Curitiba and Porto Alegre).

    In Curitiba, routine immunization with Hib polyribosylribitol phosphate polysaccharide-tetanus toxoid conjugate vaccine (PRP-T) in combination with diphtheria-tetanus toxoids-pertussis vaccine (PRP-T/DTP) has been offered since September 1996 ; DTP vaccine alone is routinely given in Porto Alegre.

    Children in Porto Alegre (n=643) were 8 times less likely to have received adequate Hib vaccination and 4 times more likely to be Hib carriers than children in Curitiba (n=647 ; i.e., point prevalence of oropharyngeal colonization, 4.8% vs. 1.2%). Point prevalence of carriage with non-type b or other nontypeable Hi was similar in children of both cities.

    There was a vaccination effect on carriage rates in children who received a primary 3-dose series, independent of the booster dose, suggesting that a booster may be unnecessary to induce population protection.

    Mots-clés Pascal : Haemophilus influenzae, Pasteurellaceae, Bactérie, Enfant, Homme, Garderie enfant, Epidémiologie, Vaccination, Prévalence, Immunoprotection, Vaccin associé, Diphtérie, Bactériose, Infection, Tétanos, Anatoxine, Coqueluche, Toxine, Brésil, Amérique du Sud, Amérique

    Mots-clés Pascal anglais : Haemophilus influenzae, Pasteurellaceae, Bacteria, Child, Human, Day care center, Epidemiology, Vaccination, Prevalence, Immunoprotection, Mixed vaccine, Diphtheria, Bacteriosis, Infection, Tetanus, Toxoid, Whooping cough, Toxin, Brazil, South America, America

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 99-0492141

    Code Inist : 002A05B12. Création : 22/03/2000.