Equity Effects of Food Microbiology Health Coverage on Avoidable Care Delays in Kenya: A Target-Trial Emulation

Foodborne disease constitutes a substantial burden of preventable morbidity in Kenya, yet the pathway from food safety failure to adverse health outcomes is mediated by the accessibility and timeliness of clinical care. the present analysis argues that the equity effects of food microbiology health coverage cannot be understood solely through the lens of laboratory capacity or pathogen surveillance, because the benefits of such coverage are conditional on the ability of populations to convert diagnostic information into timely therapeutic action. We develop a target-trial emulation framework to conceptualise how alternative configurations of food microbiology services—centralised reference laboratories, county-level diagnostic hubs, and community-based testing—would differentially affect avoidable care delays across socioeconomic strata in Kenya. The analysis specifies the causal contrast, eligibility criteria, assignment mechanism, and estimands required for a hypothetical randomised trial comparing coverage models, then identifies the observational data structures and identification assumptions needed to emulate that trial using routine health and food safety records. We propose that the equity-relevant parameter is not the average reduction in delay but the distribution of delay reductions across wealth quintiles, distance-to-facility gradients, and gender. The framework clarifies why expanding coverage without attending to referral logistics, result communication, and household-level care-seeking constraints may widen rather than narrow inequities. We conclude by specifying the design of a prospective emulation using existing surveillance and health administrative data, and by delineating the sensitivity analyses necessary to probe violations of the identification assumptions.