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Studies on Plesiomonas shigelloides isolated from different environments

González-Rey, Carlos (2003). Studies on Plesiomonas shigelloides isolated from different environments. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Veterinaria, 1401-6257 ; 156
ISBN 91-576-6383-1
[Doctoral thesis]

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Plesiomonas shigelloides is an aquatic microorganism recognised recently as potential human and animal pathogen. Plesiomonads are Gram-negative, motile, non-sporeforming bacilli, facultative anaerobic and oxidase positive. Since 2001, P. shigelloides belongs to the family Enterobacteriaceae. The primary reservoirs for this bacterium are fresh- and estuarine water, mainly in temperate climates. Although there were reports on the isolation of P. shigelloides from human patients in Sweden, the occurrence of this bacterium in Swedish freshwaters had not been studied yet. The presence of plesiomonads in lakes and rivers in Sweden is reported for the first time. Interestingly, some serovars seem to be geographically correlated. Some bacterial pathogens have been previously found in extreme climates such as the Polar Circle area. Surprisingly, the investigation of fresh water from lakes north of the Polar Circle in Sweden revealed the presence of P. shigelloides. Non-agglutinating isolates were found which suggest the finding of new serovars. Molecular techniques showed that they were genotypically different. Antimicrobial susceptibility tests showed that P. shigelloides presents a natural resistance to b-lactams despite the geographical region from where they were isolated. Furthermore, some strains may carry genes for resistance to tetracyclines. A correct identification of bacteria is crucial to determine the adequate treatment and for epidemiological studies. P. shigelloides is not specified in many clinical laboratories; therefore, a PCR for specific detection of this bacterium was developed. Detection was successful for all the isolates tested despite their serovar, source of isolation or geographical origin. The primers did not amplify genetic material from close related bacteria. Various molecular techniques were evaluated for genotyping P. shigelloides of the same serovar. PFGE and RAPD showed the highest discriminatory skills detecting 22 and 21 genotypes, respectively, among 24 strains. Animal-human pairs from the same geographical area presented an equal genotype. This finding is the first molecular evidence of the possible role of P. shigelloides as a zoonotic agent. In conclusion, this thesis research has contributed significantly to our knowledge of P. shigelloides by providing new information on its distribution, its specific detection by PCR, intra-species relationship and its possible relation with zoonotic cases.

Authors/Creators:González-Rey, Carlos
Title:Studies on Plesiomonas shigelloides isolated from different environments
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Veterinaria
Year of publishing :June 2003
Number of Pages:45
ALLI. Krovacek, K., Eriksson, L.M., González-Rey, C., Rosinsky, J. and Ciznar, I. (2000) Isolation, biochemical and serological characterisation of Plesiomonas shigelloides from freshwater in Northern Europe. Comp. Immunol. Microbiol. Infect. Dis. 23, 45-51. II. González-Rey, C., Svenson, S.B., Eriksson, L.M., Ciznar, I. and Krovacek, K. (2003) Unexpected finding of the “tropical” bacterial pathogen –Plesiomonas shigelloides- from lake water north of the Polar Circle. Accepted for publication in Polar Biology. III. González-Rey, C., Svenson, S.B., Bravo, L., Siitonen, A., Pasquale, V., Dumontet, S., Ciznar, I. and Krovacek, K. (2003) Serotypes and antimicrobial susceptibility of Plesiomonas shigelloides isolates from humans, animals and aquatic environments in different countries. Submitted for publication. IV. González-Rey, C., Svenson, S.B., Bravo, L., Rosinsky, J., Ciznar, I. and Krovacek, K. (2000) Specific detection of Plesiomonas shigelloides isolated from aquatic environments, animals and human diarrhoeal cases by PCR based on 23S rRNA gene. FEMS Immunol. Med. Microbiol. 29, 107-113. V. González-Rey, C., Siitonen, A., Bravo, L., Ciznar, I., Svenson, S.B. and Krovacek, K. (2003) Molecular techniques for genotyping Plesiomonas shigelloides of the same serovar. Submitted for publication.
Place of Publication:Uppsala
ISBN for printed version:91-576-6383-1
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L73 Animal diseases
Subjects:Not in use, please see Agris categories
Agrovoc terms:plesiomonas shigelloides, geographical distribution, polar regions, aquatic environment, serotypes, pcr, genotypes
Keywords:Plesiomonas shigelloides, distribution, Polar Circle, aquatic environment, serotyping, antibiotic susceptibility, PCR, detection, PFGE, genotyping
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ID Code:307
Department:(VH) > Institutionen för veterinärmedicinsk mikrobiologi
Deposited By: Staff Epsilon
Deposited On:16 Jun 2003 00:00
Metadata Last Modified:02 Dec 2014 10:03

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