ETD Collection

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Subject: search.filters.subject.Vaccines, Conjugate

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    A randomised trial of the safety and immunogenicity of low dose haemophilus conjugate vaccine in healthy infants at 6,10, and 14 weeks of age
    (2002-09-01) Nicol, Mark. Patrick.
    Background Despite their proven efficacy, Haemophilus influenzae type b (Hib) conjugate vaccines are not given to most children in the developing world in the face of an estimated global Hib disease burden of nearly 2 million cases per annum. A major barrier to the introduction of the vaccine would be overcome by diluting the vaccine tenfold in DTP. We report a randomised trial comparing the use of Hib conjugate vaccine diluted tenfold in a multidose vial of DTP, with that of the full Hib dose.
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    Impact of the pneumococcal conjugate vaccine on culture-confirmed pulmonary tuberculosis in hospitalized children
    (2015-09-04) Mammen, Vijay
    Children hospitalized with culture-confirmed pulmonary tuberculosis (PTB) frequently present with acute symptoms, possibly because underlying PTB may predispose to superimposed bacterial pneumonia. Immunization of children with pneumococcal conjugate vaccine (PCV) could protect against such superimposed bacterial pneumonia and reduce the incidence of PTB hospitalization. OBJECTIVE We studied the temporal association of childhood immunization with pneumococcal conjugate vaccine on the incidence of hospitalization for culture-confirmed PTB in children. METHODS A retrospective study on the incidence of hospitalization for culture-confirmed childhood PTB at Chris Hani Baragwanath Academic Hospital was undertaken from 2005 to 2012. This included a pre-PCV era (2005-2008) and a PCV era (2011-2012). RESULTS Overall, there was a 69.2% (95% CI: 62.8-74.6%) decline in the incidence of hospitalization for culture-confirmed PTB when comparing the PCV and pre-PCV-eras, with the decline in HIV-uninfected children only significant in the 3-11 month age category and the decline in HIV-infected significant across all age categories. There was a trend for reduced pneumococcal bacteraemia in the PCV era compared to the pre-PCV era, with the odds of having a blood culture positive for pneumococcus being 1.91-fold (95% CI, 0.26-84.56) greater in the Pre-PCV era. CONCLUSION There has been a significant decline in culture-confirmed PTB hospitalization in children comparing the pre-PCV to the PCV-era. However, the incidence of culture-confirmed PTB prior to the introduction of PCV had been reduced to low levels due to antiretroviral therapy. This confounder together with the retrospective ecological study design and other several possible confounders limited any robust estimate as to whether there was a temporal association between PCV immunization and incidence of culture-confirmed PTB hospitalization in our study setting.