scholarly journals Plasmodiophora brassicae in Mexico, from anecdote to fact

2021 ◽  
Author(s):  
Legnara Padrón-Rodríguez ◽  
Carlos Roberto Cerdan Cabrera ◽  
Nadia Guadalupe Sanchez Coello ◽  
Mauricio Luna-Rodriguez ◽  
Edel Pérez-López
Keyword(s):  
Scientific Literature ◽  
Positive Response ◽  
Plasmodiophora Brassicae ◽  
Grey Literature ◽  
Pcr Assay ◽  
Clubroot Disease ◽  
Agricultural Communities ◽  
Specific Pcr ◽  
Specific Pcr Assay ◽  
First Time

For years, the presence of clubroot disease and its causal agent, Plasmodiophora brassicae, in Mexico has been given by granted. However, after a long search in the scientific literature in English and Spanish, as well as grey literature including thesis and government reports, we were not able to find any information regarding the actual detection of the pathogen, hosts affected, areas with the disease, or any real information about clubroot ('hernia de la col', in Mexico). To confirm if P. brassicae was indeed in Mexico, we started a true detective adventure. First, we identified agricultural communities in south-east Mexico known to grow cruciferous crops. Second, we asked to the growers if they have ever seen clubroot symptoms, showing them during the inquires pictures of the characteristic galls that might have been present in their crops. Third, we collected soil from two of the communities with positive response and grew an array of cruciferous in the soil as baits to 'fish' the clubroot pathogen. We detected the presence of galls in the roots of 32 plants and observed the presence of resting spores. Through a P. brassicae specific PCR assay, we were able to confirm the presence of the clubroot pathogen in the samples and in Mexico for the very first time. This study is the first report and identification of P. brassicae in Mexico, opening the doors to understand the genetic diversity of this elusive and devastating plant pathogen.

Identification of Klebsiella oxytoca using a specific PCR assay targeting the polygalacturonase pehX gene

2003 ◽  
Vol 154 (8) ◽  
pp. 587-592 ◽  
Author(s):  
Gennadiy Kovtunovych ◽  
Tetyana Lytvynenko ◽  
Valentyna Negrutska ◽  
Olena Lar ◽  
Sylvain Brisse ◽  
...  
Keyword(s):  
Klebsiella Oxytoca ◽  
Pcr Assay ◽  
Specific Pcr ◽  
Specific Pcr Assay

scholarly journals Genus Level Identification of Mycobacteria from Clinical Specimens by Using an Easy-To-Handle Mycobacterium-Specific PCR Assay

1998 ◽  
Vol 36 (3) ◽  
pp. 614-617 ◽  
Author(s):  
Fritz Stauffer ◽  
Heinrich Haber ◽  
Armin Rieger ◽  
Robert Mutschlechner ◽  
Petra Hasenberger ◽  
...  
Keyword(s):  
Positive Result ◽  
Internal Control ◽  
Specific Probe ◽  
Culture Result ◽  
Pcr Assay ◽  
Clinical Specimens ◽  
Genus Level ◽  
Specific Pcr ◽  
Specific Pcr Assay ◽  
Culture Positive

An easy-to-handle Mycobacterium-specific PCR assay for detection of the presence of a wide range of mycobacterial species in clinical samples was evaluated. The performance of the genus probe was compared with the performance of probes specific forMycobacterium tuberculosis and Mycobacterium avium and with that of standard culture. In addition, the utility of an internal control in monitoring amplification inhibitors was studied. Of 545 respiratory and 325 nonrespiratory specimens (a total of 870 specimens), 58 (6.7%) showed the presence of amplification inhibitors, as determined by a negative result for the internal control. Of these 58 specimens, 31 (53%) were stool specimens; other material, even citrate blood after lysis of erythrocytes, did not pose a problem with regard to inhibition of PCR amplification. Eighty-one of the remaining 812 specimens had a positive Mycobacterium culture result. Of these culture-positive specimens, 58 (71.6%) showed a positive result with the Mycobacterium genus-specific probe. Seventy-two samples had a positive result with theMycobacterium-specific probe but a negative culture result. Of these 72 samples, 26 samples were regarded as true positive, either because the M. tuberculosis- or M. avium-specific probe was also positive at the same time or because other specimens from the same patient taken at the same time were culture positive. The sensitivity of theMycobacterium-specific probe was 78.5% and the specificity was 93.5%. This study showed that pretesting of clinical specimens for mycobacteria to the genus level with aMycobacterium-specific probe offers the routine clinical laboratory the possibility of detecting tuberculous and nontuberculous mycobacteria with one test. Furthermore, specimens testing positive with the genus-specific probe can be immediately identified with species-specific probes.

scholarly journals Evaluation of a vanA-Specific PCR Assay for Detection of Vancomycin-Resistant Enterococcus faecium during a Hospital Outbreak

1999 ◽  
Vol 37 (10) ◽  
pp. 3348-3349 ◽  
Author(s):  
Michel Roger ◽  
Marie-Claude Faucher ◽  
Pierre Forest ◽  
Pierre St-Antoine ◽  
François Coutlée
Keyword(s):  
Enterococcus Faecium ◽  
Pcr Assay ◽  
Culture Methods ◽  
Agar Culture ◽  
Enrichment Broth ◽  
Specific Pcr ◽  
Hospital Outbreak ◽  
Vancomycin Resistant Enterococci ◽  
Vancomycin Resistant ◽  
Specific Pcr Assay

We investigated the use of PCR as an alternative to culture of fecal samples for detection of vanA-containingEnterococcus faecium during a recent hospital outbreak. Rectal swabs collected consecutively from 223 patients were analyzed by culture with and without enrichment broth and byvanA-specific PCR of enrichment broth samples. Fifty-five specimens were positive for vanA-containing E. faecium by at least one method. The sensitivities of thevanA-specific PCR assay and agar culture with and without enrichment broth were 94.5, 98, and 89%, respectively. All three methods were 100% specific. Final results were obtained much more rapidly by PCR (within 24 to 30 h of specimen submission) than by the culture methods (4 to 5 days). Thus, PCR is an accurate and rapid alternative to culture for detection of vancomycin-resistant enterococci during hospital outbreaks.

Species-specific PCR assay for L. infantum/L. donovani discrimination

Acta Tropica ◽  
2006 ◽  
Vol 100 (3) ◽  
pp. 241-245 ◽  
Author(s):  
Mallorie Hide ◽  
Anne-Laure Bañuls
Keyword(s):  
Pcr Assay ◽  
Specific Pcr ◽  
Specific Pcr Assay ◽  
Species Specific
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