Title Comparative evaluation of conventional double incubation culture methods for the isolation of M. paratuberculosis from bovine fecal samples
Author(s) Singh SN, Maddux RL, Kadel WL.
Institution(s) Murray State University, Breathitt Veterinary Center, Hopkinsville, Kentucky 42240 USA.
Source Third International Colloquium on Paratuberculosis
Section 1: Laboratory Diagnosis
Abstract
This investigation was conducted to evaluate the efficiency of conventional old method with that of the new method (two step germination) in our diagnositic laboratory using 5.0 g samples for fecal culture. Using the old method, out of a total of 417 suspected clinical fecal samples cultured, 170 (40.8%) were positive with a contamination rate of 4.96%. During the same period, out of 625 herd samples, 17 (2.7%) were found positive with a 7.2% contamination rate. Using the two step germination procedure, out of a total of 335 suspected clinical fecal samples, 135 (40.29%) yielded positive culture with a contamination rate of 2.08%. Whereas, out of 450 herd samples, 10 (2.22%) were found positive. Furthermore, the same 69 clinical fecal samples were compared in parallel cultures using both methods, of which 26 (37.68%) and 27 (39.1%) were positive by the old and new methods, respectively, indicating a higher sensitivity of the new method. In addition, the new method was considerably superior in reducing the rate of culture contamination.

Source: http://www.paratuberculosis.org/pubs/proc3/page84.htm
Contact: Click here to Send an inquiry email      Webmaster: Click here to email the webmaster
Copyright © 1999-2008 International Association for Paratuberculosis.