Persistent Strains
Mostrando 25-36 de 299 artigos, teses e dissertações.
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25. Acquired resistance to facultative intracellular bacteria: relationship between persistence, cross-reactivity at the T-cell level, and capacity to stimulate cellular immunity of different Listeria strains.
C57BL/6 mice were infected with different strains of Listeria sp., and bacterial survival in spleens was assessed. Six strains (EGD, NCTC 5348, ATCC 19113, ATCC 19114, NCTC 10527, and ATCC 19116) were able to persist in spleens (persistent strains), whereas with five other strains (ATCC 19111, ATCC 19119, ATCC 33090, ATCC 33091, and ATCC 14870), only few if
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26. Sialylation of the Host Receptor May Modulate Entry of Demyelinating Persistent Theiler's Virus
Theiler's murine encephalomyelitis virus (TMEV) is a picornavirus of the Cardiovirus genus. Certain strains of TMEV may cause a chronic demyelinating disease, which is very similar to multiple sclerosis in humans, associated with a persistent viral infection in the mouse central nervous system (CNS). Other strains of TMEV only cause an acute infection withou
American Society for Microbiology.
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27. Highly lytic and persistent lentiviruses naturally present in sheep with progressive pneumonia are genetically distinct.
Ovine and caprine lentiviruses share the capacity to induce slowly progressive and inflammatory diseases of the central nervous system (leukoencephalitis or visna), lungs (progressive pneumonia or maedi), and joints (arthritis) in their natural hosts. Studies on their replication indicated that ovine lentiviruses and caprine arthritis-encephalitis virus (CAE
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28. Variation in metabolic enzyme activity of persistent Haemophilus influenzae in respiratory tracts of patients with cystic fibrosis.
Haemophilus influenzae organisms were isolated from sputum specimens prospectively collected from 40 patients with cystic fibrosis during 2 years to study variations in the metabolic enzyme activities of persistent H. influenzae strains as determined by biotyping. In total, 97 distinct H. influenzae strains without variations in their major outer membrane pr
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29. Pathogen and host differences in bacterial adherence to human buccal epithelial cells in a northeast Brazilian community.
The adherence of several strains of Escherichia coli to human buccal epithelial cells was studied, using cells obtained from five groups: healthy adults, healthy children, children with acute diarrhea, children with persistent diarrhea associated with cryptosporidial parasites, and children with noncryptosporidial persistent diarrhea. All groups lived or wor
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30. Analysis of Cellular Mutants Resistant to Theiler’s Virus Infection: Differential Infection of L929 Cells by Persistent and Neurovirulent Strains
Theiler’s murine encephalomyelitis virus (TMEV) is a natural pathogen of the mouse and belongs to the Picornaviridae family. TMEV strains are divided into two subgroups on the basis of their pathogenicity. The first group contains two neurovirulent strains, FA and GDVII, which cause a rapid fatal encephalitis. The second group includes persistent strains,
American Society for Microbiology.
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31. Antimicrobial Susceptibility of Haemophilus influenzae in the Respiratory Tracts of Patients with Cystic Fibrosis
We analyzed the antimicrobial susceptibilities of Haemophilus influenzae isolates from 157 sputum specimens prospectively collected from 39 cystic fibrosis (CF) patients during a 2-year study. These isolates were characterized by random amplified polymorphic DNA analysis and major outer membrane protein (MOMP) analysis to identify H. influenzae strains and M
American Society for Microbiology.
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32. Efficiency of viral entry determines the capacity of murine erythroleukemia cells to support persistent infections by mammalian reoviruses.
To determine mechanisms by which persistent viral infections are established and maintained, we initiated persistent infections of murine erythroleukemia (MEL) cells by using reovirus strains type 3 Abney and type 3 Dearing. Establishment of persistent reovirus infections of MEL cells was not associated with a significant cytopathic effect despite the presen
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33. Infection of class II-deficient mice by the DA strain of Theiler's virus.
The DA strain of Theiler's virus causes, in susceptible strains of mice, a persistent infection of the white matter of the spinal cord accompanied by chronic inflammation and primary demyelination. In resistant strains, including all H-2b strains, mice clear the infection after 1 to 2 weeks. We inoculated RHAbetao/o mice, an H-2b strain which does not expres
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34. Human Factor in Staphylococcus aureus Nasal Carriage
Persistent nasal carriers and noncarriers of Staphylococcus aureus were inoculated with a mixture of different S. aureus strains. The majority of noncarriers and nearly all persistent carriers returned to their original carrier state after artificial inoculation. Furthermore, the majority of persistent carriers tested positive again for their original reside
American Society for Microbiology.
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35. Variation in Biofilm Formation among Strains of Listeria monocytogenes
Contamination of food by Listeria monocytogenes is thought to occur most frequently in food-processing environments where cells persist due to their ability to attach to stainless steel and other surfaces. Once attached these cells may produce multicellular biofilms that are resistant to disinfection and from which cells can become detached and contaminate f
American Society for Microbiology.
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36. Non-AUG-Initiated Internal Translation of the L* Protein of Theiler's Virus and Importance of This Protein for Viral Persistence
Theiler's virus is a neurotropic murine picornavirus which, depending on the strain, causes either acute encephalitis or persistent demyelinating disease. Persistent strains of Theiler's virus (such as DA) produce an 18-kDa protein called L* from an open reading frame overlapping that encoding the viral polyprotein. Neurovirulent strains (such as GDVII) are
American Society for Microbiology.