Potsdam, Universiẗat, Diss., 2005.

Braunschweig, Techn. Universiẗat, Diss., 2003.

München, Techn. Universiẗat, Diss., 2001.

Braunschweig, Techn. Universiẗat, Diss., 2001.

Würzburg, Universiẗat, Diss., 2000. / Erscheinungsjahr an der Haupttitelstelle: 2000.

Thesis (Ph. D.)--University of Hawaii at Manoa, 2001. / Includes bibliographical references (leaves 183-204). Also available on microfiche.

Listeriamonocytogenes causes listeriosis and is one of the most virulent foodborne pathogens. Different subtyping techniques classified L. monocytogenes into four genetic lineages(I, II,III and IV)and seventeen serotypes. Most outbreaks of listeriosis are caused by lineage I. Lineage II is mostly associated with sporadic listeriosis, while Lineage III strains are typically lower risk for causing listeriosis. Listeriosis mainly affectselderly, immunosuppressed, children,andpregnant women causing fetal death, miscarriage, meningitis, encephalitis, and septicemia. Therefore, it is important to differentiate high-risk strains from low-risk strains, which will permit early and appropriate interventions. Our main goal in this current work is to detect candidate biomarkers unique to lineage III strains that can be used to differentiate lineage III strains from lineage I and II. To achieve this goal, mass spectrometry, bioinformatics,and comparative proteomics were applied to detect biomarkers unique to lineage III strains.

Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 160-170). Also available via the Internet.

El presente estudio se realizó con la finalidad de caracterizar cepas clínicas de Listeria monocytogenes aisladas en el Hospital San Bartolomé de Lima- Perú durante los años 2001 a 2005. Durante el periodo del estudio, se identificaron 18 casos de listeriosis perinatal, de los cuales fueron aisladas 20 cepas de L. monocytogenes. Las cepas fueron caracterizadas mediante pruebas convencionales y técnicas de biología molecular. Las 20 cepas en estudio fueron identificadas mediante las características fenotípicas conocidas de L. monocytogenes, tales como presencia de β-hemólisis incompleta, reacción de Christhie, Atkins y Munch-Peterson positiva con S. aureus y negativa con R. equi, así como la utilización de carbohidratos como D-glucosa y L-ramnosa, pero no de D-xilosa ni D-manitol. Todas las cepas fueron confirmadas mediante la reacción en cadena de la polimerasa y tipificadas por la técnica del ADN polimórfico amplificado al azar (RAPD). Con los cebadores OMP-01 y PJ108 se obtuvieron 6 RAPD tipos, distribuidas así: ocho cepas del tipo A-I, tres de cada uno de los tipos A-II, A-III y B-II, dos del tipo B-I y una del tipo A-IV. Se concluye que, en los 18 casos de listeriosis se obtuvieron 20 cepas de L. monocytogenes con seis genotipos diferentes, siendo el RAPD tipo A-I el más frecuente (8/20, 40%) entre las cepas estudiadas. / --- This study was conducted in order to characterize strains of Listeria monocytogenes isolates from the San Bartolome´s Hospital in Lima-Peru during the years from 2001 to 2005. During the study period, we identified 18 cases of perinatal listeriosis, which were isolated 20 strains of L. monocytogenes. The strains were characterized by conventional tests and molecular biology techniques. The 20 strains studied were identified by known phenotypic characteristics of L. monocytogenes, such as the presence of incomplete β-hemolysis, positive CAMP reaction with S. aureus and negative CAMP reaction with R. equi, and the use of carbohydrates as D-glucose and L-rhamnose but not from D-xylose or D-mannitol. The strains of L. monocytogenes were confirmed by polymerase chain reaction and typed by random amplified polymorphic DNA (RAPD) technique. With the primers OMP-01 and PJ108 were obtained six RAPD types, distributed as follows: eight strains of type AI, three of each type A-II, A-III and B-II, two type B-I and one strain of type A-IV. We conclude that, in 18 cases of listeriosis were obtained 20 strains of L. monocytogenes with six different genotypes, RAPD type A-I being the most frequent (8/20, 40%) among the studied strains. / Tesis

El presente estudio se realizó con la finalidad de caracterizar cepas clínicas de Listeria monocytogenes aisladas en el Hospital San Bartolomé de Lima- Perú durante los años 2001 a 2005. Durante el periodo del estudio, se identificaron 18 casos de listeriosis perinatal, de los cuales fueron aisladas 20 cepas de L. monocytogenes. Las cepas fueron caracterizadas mediante pruebas convencionales y técnicas de biología molecular. Las 20 cepas en estudio fueron identificadas mediante las características fenotípicas conocidas de L. monocytogenes, tales como presencia de β-hemólisis incompleta, reacción de Christhie, Atkins y Munch-Peterson positiva con S. aureus y negativa con R. equi, así como la utilización de carbohidratos como D-glucosa y L-ramnosa, pero no de D-xilosa ni D-manitol. Todas las cepas fueron confirmadas mediante la reacción en cadena de la polimerasa y tipificadas por la técnica del ADN polimórfico amplificado al azar (RAPD). Con los cebadores OMP-01 y PJ108 se obtuvieron 6 RAPD tipos, distribuidas así: ocho cepas del tipo A-I, tres de cada uno de los tipos A-II, A-III y B-II, dos del tipo B-I y una del tipo A-IV. Se concluye que, en los 18 casos de listeriosis se obtuvieron 20 cepas de L. monocytogenes con seis genotipos diferentes, siendo el RAPD tipo A-I el más frecuente (8/20, 40%) entre las cepas estudiadas. / This study was conducted in order to characterize strains of Listeria monocytogenes isolates from the San Bartolome´s Hospital in Lima-Peru during the years from 2001 to 2005. During the study period, we identified 18 cases of perinatal listeriosis, which were isolated 20 strains of L. monocytogenes. The strains were characterized by conventional tests and molecular biology techniques. The 20 strains studied were identified by known phenotypic characteristics of L. monocytogenes, such as the presence of incomplete β-hemolysis, positive CAMP reaction with S. aureus and negative CAMP reaction with R. equi, and the use of carbohydrates as D-glucose and L-rhamnose but not from D-xylose or D-mannitol. The strains of L. monocytogenes were confirmed by polymerase chain reaction and typed by random amplified polymorphic DNA (RAPD) technique. With the primers OMP-01 and PJ108 were obtained six RAPD types, distributed as follows: eight strains of type AI, three of each type A-II, A-III and B-II, two type B-I and one strain of type A-IV. We conclude that, in 18 cases of listeriosis were obtained 20 strains of L. monocytogenes with six different genotypes, RAPD type A-I being the most frequent (8/20, 40%) among the studied strains.