Experimental validation of a nested polymerase chain reaction targeting the genetic element ISMAP02 for detection of Mycobacterium avium subspecies paratuberculosis in bovine colostrum.
Colostrum samples experimentally inoculated with Mycobacterium avium subsp. paratuberculosis (MAP; strain K-10) at increasing concentrations between 1 x 10(1) and 1 x 10(9) cells/ml were tested for recovery of MAP DNA using a nested ISMAP02 target polymerase chain reaction initially developed for detecting MAP DNA in fecal samples. The following detection rates were achieved for sample replicates inoculated with unsonicated MAP pure stock: 100% between 1 x 10(7) and 1 x 10(9) cells/ml, 75% between 1 x 10(3) and 1 x 10(6) cells/ml, and 50% between 1 x 10(1)and 1 x 10(2) cells/ml replicates. Detection rates achieved for the colostrum sample replicates inoculated with sonicated MAP cell suspension were 75% for 1 x 10(9) cells/ml, 100% between 1 x 10(7) and 1 x 10(8) cells/ml, 75% for 1 x 10(6) cells/ml, 0 for 1 x 10(4) cells/ml, and 25% between 1 x 10(1) and 1 x 10(3) cells/ml. When negative control colostrum samples were tested, 16 of 18 (89%) samples were correctly detected as negative for MAP DNA using the current assay. In conclusion, the MAP DNA detection rates of the present assay improved with increasing concentrations of MAP in the colostrum sample replicates, although MAP DNA was also detected in 2 of 18 (11%) negative control samples, suggesting an undefined technical problem with the assay or, perhaps, sample contamination during preparation. Overall, the present findings suggest a potential role of the proposed polymerase chain reaction assay to detect MAP in colostrum. However, adoption of this test for use in routine screening of field colostrum for MAP awaits findings from an ongoing field validation study.
Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, 900 East Campus Drive, Columbia, MO 65211, USA. pithua@missouri.edu
Patrick
P
Pithua
Scott J
SJ
Wells
Sandra M
SM
Godden
Srinand
S
Sreevatsan
Judith R
JR
Stabel
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D003126:Colostrum / Q000382:microbiology*; D004251:DNA Transposable Elements / Q000235:genetics*; D004269:DNA, Bacterial / Q000302:isolation & purification*; D016927:Mycobacterium avium subsp. paratuberculosis / Q000302:isolation & purification*; D010283:Paratuberculosis / Q000175:diagnosis*; D016133:Polymerase Chain Reaction / Q000379:methods / Q000662:veterinary*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D004251:DNA Transposable Elements; D004269:DNA, Bacterial