Abstract
In the biological study of Chlamydia, it is very important to determine the infectivity titer of the organism. For many years researchers used the serial dilution method to determine this titer. This method consists of diluting the material to be examined, inoculating suitable dilutions into susceptible cell cultures and cultivating them. The number of inclusions formed in host cells can be calculated with the naked eye under a microscope. The precision and accuracy of this method, however, depend on the number of inclusions per field and the number of fields counted. In this report, we present a simple and rapid method for counting a large number of inclusions using an image analysis system and an appropriate number of samples, and propose a sampling method based on a statistical analysis of the data obtained with 84 microscopic fields.
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