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Of course it might be argued that the first data set also represents a bimodal distribution. In other words that there are actually two common microfilarial concentrations - at around 200 microfilariae per ml of blood and at around 1000 microfilariae per ml of blood, perhaps represent different species or forms of parasites.

This is where it is important to know the biology of the organism in order to properly interpret the statistics. In the case of parasite numbers, such distributions are commonly recorded for single species of parasites. This is because, with many parasitic infections, a few individuals tend to be very heavily infected.

With the tetracycline retail prices, there are two modes because the product is available in two main formulation strengths.