Optimization of Culture Protocols to Isolate Leptospira spp. from Environmental Water, Field Investigation, and Identification of Factors Associated with the Presence of Leptospira spp. in the Environment

Tropical Medicine and Infectious Disease
Udomsak NarkkulWirichada Pan-Ngum

Abstract

The successful culture of Leptospira spp. from the environment is challenging. Here, we optimized the isolation of Leptospira spp. from water samples spiked with different species and initial concentrations of this organism. The time periods between water sampling and the isolation process were varied (0, 2, and 4 weeks). Bacterial cultures were observed under a microscope, and cultures were graded for cell density, weekly, for 12 weeks. Most pathogenic Leptospira spp. were difficult to culture under all conditions. All conditions of water samples spiked with novel species of Leptospira subclade P1 were culture positive within 2 weeks. For Leptospira subclade P2, storing samples for 2 weeks prior to isolation resulted in more successful isolation compared with isolation after other storage conditions. For subclade S1, all samples with initial bacterial concentrations of more than 103 colonies/mL, under all storage conditions, were successfully cultured. These results suggest that storing contaminated water samples for 2 to 4 weeks in the dark at an ambient temperature prior to culturing can improve the isolation of Leptospira spp. from the samples. We implemented this protocol and collected water samples from natural sources ac...Continue Reading

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Citations

Dec 10, 2020·Tropical Medicine and Infectious Disease·Somjit ChaiwattanarungruengpaisanMetawee Thongdee
Feb 7, 2021·Scientific Reports·Udomsak NarkkulWirichada Pan-Ngum
Aug 29, 2021·Pathogens·Aina Nadheera Abd RahmanNarcisse Joseph

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