Lessons from the equator: a window on the future of vibriosis in a warming Earth
Neoh, C. C.; Hill, E. D.; Orata, F. D.; Baker-Austin, C.; Hast, M.; Hughes, M. J.; Keng, B. M. H.; Martin, P.; Tan, Y. E.; Wong, C. S. L.; Chew, K. L.; Chan, S. G. D.; Chen, Y.; Barkham, T.; Mishra, S.; Martinez-Urtaza, J.; Mather, A. E.; Lee, C.; Boucher, Y. F.
Show abstract
Vibrios are important aquatic human pathogens, causing gastroenteritis, wound infections, and cholera. Vibriosis (non-cholera infection) has been increasing in temperate climates due to correlation between Vibrio abundance and water temperature. However, how warming oceans differentially influence various Vibrio species, and whether incidence is higher in tropical regions, remains understudied. We assembled the first comprehensive dataset of culture-confirmed vibriosis cases outside a temperate climate from equatorial Singapore. Comparison to cases from the detailed United States (US) CDC COVIS system revealed that vibriosis incidence is over two times higher in Singapore than the United States. Causative species also differ markedly, with Vibrio fluvialis and non-toxigenic Vibrio cholerae dominating in Singapore (>40%) but are much less prominent in the United States (<15%). Singapore cases have remained stable in the last decade, while US incidence is rising rapidly, especially for V. fluvialis and V. cholerae (13% and 17% per year). Differences in causative species in Singapore and the United States suggest ecological factors may shape infection dynamics, with some species benefitting more from warming oceans, raising their equatorial prominence. Incidence is stable in Singapore, likely due to slower warming of waters near the equator. In contrast, vibriosis in the United States will likely continue to increase steadily, with changing species composition, likely becoming tropicalized.
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