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Subclinical malaria presents a challenge to global malaria elimination efforts. It often evades detection by conventional diagnostic tools due to low parasite densities. Despite being clinically silent, asymptomatic infections within the broader spectrum of subclinical malaria serve as hidden reservoirs that sustain transmission. Their persistence arises from a multifaceted interplay of parasite adaptations, including density thresholds, antigenic variation, cytoadhesion, multiplicity of infection, and emerging drug resistance, and host-related factors such as naturally acquired immunity, age, pregnancy, genetic polymorphisms, and epigenetic influences. Chronic subclinical and asymptomatic infections are associated with anemia, impaired cognitive development in children, and adverse pregnancy outcomes. This article examines the epidemiological burden, biological mechanisms, diagnostic challenges, and health consequences of subclinical malaria. The urgent need for field-deployable, sensitive diagnostic tools and integrative approaches is underscored. Understanding the mechanisms sustaining subclinical and asymptomatic infections is essential for targeted interventions and malaria elimination.
Ranjha et al. (Sun,) studied this question.