The Classification of Bacillus thuringiensis

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Abstract
Summary. Forty‐six isolates of protein crystal‐forming bacteria pathogenic for insects were studied in an attempt to correlate classifications based on biochemical reactions, flagellar antigens, and esterase patterns obtained when cell extracts were analysed by electrophoresis in starch gel.Nine serotypes were represented, one being subdivided into two subtypes on the basis of secondary H antigens. There was a close correlation between the serological classification and that based on esterase analysis. The relationships between the three types of classification are described and the significance of esterase analysis in this context is discussed.