Growth rate retardation and inhibitory effect of para-JEM(R) BLUE on Mycobacterium avium subspecies paratuberculosis.
The effect of para-JEM(R) BLUE on Mycobacterium avium subspecies paratuberculosis (MAP) inoculated into broth-based culture media was evaluated by using 84 fecal samples with known MAP status. Results showed that growth of the organism in samples inoculated into the broth without the para-JEM BLUE was detectable 1-35 days (average of 6 days) earlier in 35 of the samples (42%) compared with the same samples inoculated in broth with para-JEM BLUE. Four additional samples (5%) that were MAP positive in the culture broth that lacked the para-JEM BLUE gave negative results when the reagent was included. Of the remaining 45 samples, growth of MAP was detected 1-4 days (average of 3 days) earlier in 4 of the samples (5%) inoculated in the broth with para-JEM BLUE compared with the same samples inoculated in the broth without the para-JEM BLUE, whereas 41 samples (49%) yielded equivalent results with respect to time-to-growth detection and negative growth, regardless of whether para-JEM BLUE was present in the culture broth. However, exclusion of para-JEM BLUE from the broth increased the number of samples that produced false-positive instrument signals compared with the number that produced false-positive signals when the reagent was added. Modification of the sample processing step had no measurable effect. Observations indicated that, although elimination of para-JEM BLUE from the broth increased false-positive instrument signals, its inclusion has an adverse effect on the growth of certain MAP, which suggests that its elimination from broth cultures may increase sensitivity.
Okwumabua
Ogi
O
Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706, USA. Ogi.okwumabua@wvdl.wisc.edu
Moua
Tou Vue
TV
Danz
Tonya
T
Quinn
Joe
J
O'Connor
Mike
M
Gibbons-Burgener
Suzanne
S
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000175:diagnosis / Q000382:microbiology*; D004269:DNA, Bacterial / Q000235:genetics; D005243:Feces / Q000382:microbiology; D005260:Female; D016927:Mycobacterium avium subsp. paratuberculosis / Q000187:drug effects* / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification; D010283:Paratuberculosis / Q000175:diagnosis* / Q000382:microbiology; D016133:Polymerase Chain Reaction / Q000379:methods / Q000662:veterinary; D011247:Pregnancy
D004269:DNA, Bacterial