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Full-Text Articles in Medicine and Health Sciences
Development Of An Electrotransformation Technique For Streptococcus Iniae And Preliminary Characterization Of The Hemolysin Associated With This Bacterium, Kimberly Ann Hahn
Development Of An Electrotransformation Technique For Streptococcus Iniae And Preliminary Characterization Of The Hemolysin Associated With This Bacterium, Kimberly Ann Hahn
Biological Sciences Theses & Dissertations
Streptococcus iniae is a gram-positive organism responsible for causing disease in both freshwater as well as saltwater fish. Every year fisheries lose fish by the tons due to diseases caused by this organism. In 1991, the first reported human case of disease associated with this organism was described. Since this initial case, there have been numerous other reported cases of S. iniae infections. This organism is a catalase negative, facultatively anaerobic organism that produces a capsule and when plated onto blood agar demonstrates β-hemolytic activity.
In this study, the relationship between the hemolysin produced by S. iniae and the lactate …
Investigations Into The Innate Resistance Of The Tick, Dermacentor Variabilis, When Challenged With The Bacterium, Escherichia Coli, Shane Michael Ceraul
Investigations Into The Innate Resistance Of The Tick, Dermacentor Variabilis, When Challenged With The Bacterium, Escherichia Coli, Shane Michael Ceraul
Biological Sciences Theses & Dissertations
In addition to the soluble response, many invertebrates control bacterial infections by means of phagocytosis or melanotic encapsulation. In some insects, Escherichia coli growth is reported to be inhibited by aggregation/encapsulation. Soluble and phagocytic responses to bacterial challenge have been reported in ticks, but evidence of an aggregation/encapsulation response was reported only for inanimate (araldite) implants. This study was done to determine how ticks control infection by E. coli. Ticks were challenged by direct inoculation of bacteria into the hemocoel cavity. Using plate counts, no viable E. coli were detected I hour post-inoculation. A direct fluorescence assay (DF A) …
Effect Of Magnesium On The Production Of Scna And Scnr By Streptococcus Pyogenes, Strain Ff22, Laura E. Quinn
Effect Of Magnesium On The Production Of Scna And Scnr By Streptococcus Pyogenes, Strain Ff22, Laura E. Quinn
Biological Sciences Theses & Dissertations
The lantibiotic SA-FF22, produced by Streptococcus pyogenes strain FF22, was the first described antimicrobial peptide produced by a Streptococcus species. S. pyogenes is a group A Streptococcus responsible for such human illness as strep-throat, rheumatic fever, necrotizing fasciitis, endocarditis, and meningitis. Previous studies of SA-FF22 have shown that antimicrobial activity is lost in the presence of lmM magnesium. We hypothesize that the lack of SA-FF22 activity in the presence of magnesium is due to an absence of transcription of scnA, the gene encoding SA-FF22. The lack of transcriptional activation of scnA may be due to an absence of ScnR, a …
Vancomycin-Intermediate Staphylococcus Aureus In A Home Health-Care Patient, Jeffrey C. Hageman, David A. Pegues, Carrie Jepson, Rose Lee Bell, Mary Guinan, Kevin W. Ward, Martin D. Cohen, Janet A. Hindler, Fred C. Tenover, Sigrid K. Mcallister, Molly E. Kellum, Scott K. Fridkin
Vancomycin-Intermediate Staphylococcus Aureus In A Home Health-Care Patient, Jeffrey C. Hageman, David A. Pegues, Carrie Jepson, Rose Lee Bell, Mary Guinan, Kevin W. Ward, Martin D. Cohen, Janet A. Hindler, Fred C. Tenover, Sigrid K. Mcallister, Molly E. Kellum, Scott K. Fridkin
Public Health Faculty Publications
To date, four of the eight cases of infection by Staphylococcus aureus with reduced susceptibility to vancomycin (vancomycin-intermediate S. aureus [VISA] or glycopeptideintermediate S. aureus [GISA]) have been reported in the United States (1-3). We report a fifth case of VISA infection in the United States, and the first to occur during home health-care therapy. While all previous VISA strains have been oxacillin resistant, one of the two VISA strains identified in this investigation was oxacillin susceptible.