Effectiveness of the 23-valent polysaccharide vaccine against invasive pneumococcal disease in Navajo adults.


Invasive pneumococcal disease occurs 2-3-fold more often among Navajo adults than among adults in the general United States population. The objective of this observational study was to determine the effectiveness of the 23-valent pneumococcal polysaccharide vaccine (PPV23) among Navajo adults. Active surveillance identified cases of invasive pneumococcal… (More)


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