ArticleOpen forum infectious diseases2026
Factors Involved in Tuberculosis Recurrence in a Low-incidence Setting; Reactivation Predominates Over Reinfection in a 30-year Surveillance Study.
Article in Open forum infectious diseases, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Tuberculosis (TB) recurrence remains a significant public health concern, even in regions with low incidence. Recurrent TB may result from endogenous reactivation of a previous infection or from exogenous reinfection with a new strain. Distinguishing between these mechanisms is crucial for understanding TB dynamics and optimizing control strategies. This study aims to determine the frequency of TB recurrence in Aragón, Spain, a region with low TB incidence, and to identify factors associated with reactivation and reinfection over a 30-year period. Methods: A retrospective, descriptive study including all genotyped Results: Among 3510 genotyped TB cases, 81 (2.30%) were recurrent: 68 reactivations (1.93%) and 15 reinfections (0.42%). Reinfection was significantly associated with change of residence, HIV infection, cancer diagnosis in the second episode, and multimorbidity. Time to recurrence was significantly longer in reinfections (median 7.0 years) compared to reactivations (2.0 years). Most isolates belonged to Lineage 4 , and reinfection strains were more often linked to clustered strains circulating in the community. Conclusions: In this low-incidence setting, TB recurrence is rare and mainly the result of reactivation. Reinfections, though less frequent, are linked to mobility, HIV co-infection, neoplasm, and compromised health status. These findings underscore the importance of long-term molecular surveillance and targeted follow-up for high-risk patients.
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