Oral vaccines, whether living or non-living, viral or bacterial, elicit diminished immune responses or developed countries. Here I describe studies with a live oral cholera vaccine that include older children no longer deriving immune support from breast milk or maternal antibodies and that identify some of the factors accounting for the lower immunogenicity, as well as suggesting counter-measures that may in developing countries. The fundamental 'environmental enteropathy' that is often present in children living in fecally contaminated, impoverished environments.
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