The ecology of C-genotype and E-genotype strains of the bacterium Vibrio vulnificus and their interactions with the American oyster Crassostrea virginica

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Froelich, B. (2012). The ecology of C-genotype and E-genotype strains of the bacterium Vibrio vulnificus and their interactions with the American oyster Crassostrea virginica. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

Vibrio vulnificus is a pathogenic bacterium, routinely found in waters of estuarine environments as part of the normal microflora. This organism can be divided into two genotypes, a C-type associated with clinical isolation, and an E-type associated with environmental isolation. While it was previously known that C- and E-type cells were genetically distinct, a further distinction was found among C-type strains that has the potential to predict pathogenicity using simple PCR. It was also found that C- types cells are more rapidly taken up by oyster hosts than E-type cells in some cases, but that depuration was just as rapid for both types. These studies revealed that addition of laboratory grown bacterial strains can cause endogenous bacteria in oyster to resuscitate from the viable-but-non-culturable state. Inefficiencies in bacterial uptake in oysters led to a study that concludes that E-type strains are more readily integrated into marineaggregates that C-type strains. Most notably, V. vulnificus was observed to decline in North Carolina estuaries in response to a prolonged and severe drought.

Details
Author

Froelich, Brett

Title

The ecology of C-genotype and E-genotype strains of the bacterium Vibrio vulnificus and their interactions with the American oyster Crassostrea virginica

Physical Description

1 online resource (120 pages) : PDF

Date

2012

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

Vibrio vulnificus is a pathogenic bacterium, routinely found in waters of estuarine environments as part of the normal microflora. This organism can be divided into two genotypes, a C-type associated with clinical isolation, and an E-type associated with environmental isolation. While it was previously known that C- and E-type cells were genetically distinct, a further distinction was found among C-type strains that has the potential to predict pathogenicity using simple PCR. It was also found that C- types cells are more rapidly taken up by oyster hosts than E-type cells in some cases, but that depuration was just as rapid for both types. These studies revealed that addition of laboratory grown bacterial strains can cause endogenous bacteria in oyster to resuscitate from the viable-but-non-culturable state. Inefficiencies in bacterial uptake in oysters led to a study that concludes that E-type strains are more readily integrated into marineaggregates that C-type strains. Most notably, V. vulnificus was observed to decline in North Carolina estuaries in response to a prolonged and severe drought.

Genre

doctoral dissertations

Subjects--Topics

Biology
Microbiology

Degree

Ph.D.

Keywords

Aggregates
Bacteria
Oyster
VBNC
Vibrio
Vulnificus

Subject Area

Biology

Advisor(s)

Oliver, James

Committee Members

Ringwood, Amy
Sokolova, Inna
Parrow, Matthew
Colwell, Rita
Brown, Banita

Degree Note

Thesis (Ph.D.)--University of North Carolina at Charlotte, 2012.

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Rights Holder Information

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Identifier

Froelich_uncc_0694D_10334

Permalink

http://hdl.handle.net/20.500.13093/etd:1039