Zoonotic tuberculosis in Catalonia, Spain: Phylogenetic insights intoandtransmission at the human-livestock interface.

This genomic epidemiology study analyzedandisolates from animals and humans in Catalonia, Spain, between 2005 and 2023. Of 42 human tuberculosis (TB) cases, five were phylogenetically linked to livestock outbreaks, suggesting zoonotic transmission. The findings specifically indicate goats as a primary source oftransmission to humans. The study also revealed unexpected genetic diversity of mycobacteria within the same outbreak or even within the same patient, highlighting the complexity of tuberculosis transmission dynamics. The results underscore the value of genomic surveillance in understanding zoonotic TB transmission at the human-livestock interface and its role in informing effective control strategies.