The concept of vector efficiency in experimental studies of plague

Abstract

The need for a more adequate index of vector potential in studies of plague transmission by fleas is noted. The concept of vector efficiency is examined historically and the central problems for future work are suggested. A model for the determination of the plague vector potential of fleas is proposed in which components derived from field data are used in conjunction with the experimental vector index. Vector potential is reflected by an index relating three components in the following manner: (experimental vector index) × (field infection index) × (field prevalence index) × 100 On this basis it is suggested that the present index appears to be of practical use in evaluating simultaneously certain factors which are believed to affect the likelihood that individuals of a given flea species are vectors of plague. It is noted that the index is offered as a stage in the development of a more meaningful concept of the plague vector capacity of fleas.