Seasonal Variability of Vibrio cholerae

Charts: Seasonal Variability of Vibrio cholerae

Caption: The upper graph shows how numbers of vibrios, measured by FISH -- fluorescent DNA probes -- vary over spring to winter, from one week to the next. The lower graph shows the variation from week to week of the number of V. cholerae cells found on just one zooplankter such as a copepod.
The highest measurement was 7,100 vibrios on a single copepod, which approximates an infectious dose -- a dose, based on human volunteer studies, that could cause cholera in a human being. We see how factors at scales large and small, seasonal and microscopic, might interact to shape populations of cholera bacteria.

Source: Adapted from: J. Heidelberg, The Institute for Genomic Research


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