Genomic Epidemiology of 2023-2024 Oropouche Outbreak in Iquitos, Peru reveals independent origin from a concurrent outbreak in Brazil
Paredes-Olortegui, M.; Schiaffino, F.; Penataro-Yori, P.; Colston, J. M.; Shapiama-Lopez, V.; Pinedo-Vasquez, T.; Garcia-Bardales, P.; Flynn, T. G.; Ramal-Asayag, C.; Hughes, H. H.; Davis, E.; Russell, B. J.; Brault, A. C.; Alegre-Palomino, Y. A.; Munayco-Escate, C.; Liu, J.; Houpt, E. R.; Cooper, K. K.; Parker, C. T.; Kosek, M. N.
Show abstract
Oropouche virus is an arbovirus endemic to the Americas. Periodic outbreaks have occurred since its description in 1955. In late 2023, an outbreak occurred in Peru, centered in and around Iquitos in the Eastern Peruvian Amazon. An existing acute febrile illness (AFI) surveillance program was able to document its emergence and characterize arthralgia and dysuria and the absence of diarrhea as distinctive clinical features of Oropouche virus-associated febrile illness relative to other causes of AFI. Sequencing of isolates from the outbreak demonstrated that strains from this region were distinct from those causing disease in Brazil, despite the large-scale movement of people along the Amazon corridor, but highly similar to strains from Colombia and Ecuador. Our findings suggest that the current outbreak in South America is fundamentally multifocal in origin and not the result of geographic spread from Brazil, which experienced an outbreak between 2022 and 2024.
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