This comparative study explores incertitude about hepatitis B (HBV) and its implications for childhood vaccination in Bangui, Central African Republic, and the Cascades region, Burkina Faso. Anthropological approaches to vaccination, which counter stereotypes of "ignorant" publics needing education to accept vaccination, excavate alternative ways of knowing about illness and vaccination. We build on these approaches, evaluating different kinds of incertitude (ambiguity, uncertainty, ignorance) about infancy, HBV, health protection, and vaccination. Using interviews and participant observation, we find that Bangui and Cascades publics framed their incertitude differently through stories of infancy, illness, and protection. We locate different forms of incertitude within their historical contexts to illuminate why vaccination practices differ in the Cascades region and Bangui. A more nuanced approach to incomplete knowledge, situated in political, economic, and social histories of the state and vaccination, can contribute to more appropriate global health strategies to improve HBV prevention.

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We explore how the therapeutic landscape of Bangui, capital of the Central African Republic, shaped and reflected caregivers' home care of childhood diarrhea. Using interviews, group discussions, and participant observation, we found that caregivers described several categories of diarrhea, but in practice, adopted an experimental approach to home diarrheal care. Many managed incertitude by initially dosing children with street medicines and herbal infusions; they delayed seeking professional medical care to avoid expenses, observed their children's symptoms, consulted social networks, and used therapeutic foods. The logics underpinning these practices emerged from caregivers' conviction that diarrhea necessitated medical therapy and restricted choices within Bangui's therapeutic landscape, a consequence of lengthy political economic crisis. This crisis impoverished Bangui populations, eroded formal health care, and sharpened religious differences, discouraging care seeking from traditional healers. Analyses of therapeutic landscapes illuminate why caregivers embraced specific practices and logics and should guide the elaboration of more effective public health interventions.