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Appl Environ Microbiol. 1973 February; 25(2): 240-243
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Survivor Curves for Leptospira autumnalis Akiyami A Based on Most-Probable-Number Values

^a Department of Environmental Science and Engineering, University of North Carolina, Chapel Hill, North Carolina 27514

ABSTRACT

The validity of survivor curves for Leptospira autumnalis Akiyami A based on most-probable-number values is supported by the following observations: (i) linear regression lines fell within most of the 95% confidence intervals; (ii) linear correlation coefficients (r) were consistently high (i.e., near -1); and (iii) statistical tests for goodness of fit usually accepted the linear model. These tests are consistent with an exponential death rate for the test organism in defined solutions. The influence of temperature and pH on survival was demonstrated by showing a statistically significant difference in survivor curve slopes.

¹ Present address: Department of Environmental Health, East Tennessee State University, Johnson City, Tenn. 37601.