Article,

Long-term effect of pneumococcal conjugate vaccine on nasopharyngeal colonization by Streptococcus pneumoniae--and associated interactions with Staphylococcus aureus and Haemophilus influenzae colonization--in HIV-Infected and HIV-uninfected children

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The Journal of Infectious Diseases, 196 (11): 1662--6 (December 2007)PMID: 18008250.
DOI: 10.1086/522164

Abstract

After a primary series of 3 doses, it was found that a 9-valent pneumococcal conjugate vaccine no longer reduces nasopharyngeal colonization by vaccine serotypes in children 5.3 years of age. In addition, human immunodeficiency virus (HIV)-infected children (n=81) had a higher prevalence of colonization by Streptococcus pneumoniae and Haemophilus influenzae (71.6\% and 74.1\%, respectively) than did HIV-uninfected children (n=271; 50.9\% and 52.0\%, respectively), suggesting that increased colonization may contribute to the greater burden of pneumococcal disease in HIV-infected children. Inverse associations between colonization by S. pneumoniae and colonization by Staphylococcus aureus and between colonization by S. aureus and colonization by H. influenzae were observed only in HIV-uninfected children, possibly as a result of suboptimal adaptive immunity after previous colonization in HIV-infected children.

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