Use of antibacterial agents to elucidate the etiology of juvenile oyster disease (JOD) in Crassostrea virginica and numerical dominance of an alpha-proteobacterium in JOD-affected animals

Article Abstract:

Juvenile oyster disease (JOD) has resulted in high seasonal losses of cultured Eastern oysters since 1988. The antibacterial antibiotics norfloxacin and sulfadimethoxine-ormetoprim were tested for the ability to delay the onset of JOD mortality and/or reduce the JOD mortality of cultured juvenile Crassostrea virginica. Bacteriological analyses revealed a numerically dominant bacterium in the animals with obvious signs of JOD. Sequence analysis of the 16S rRNA gene from these bacteria indicates that they are a previously undescribed species of marine alpha-proteobacteria.

Diseases, Antibacterial agents, Bacteria, Pathogenic, Pathogenic bacteria

---

Overcoming a defect in generalized recombination in the marine fish pathogen Vibrio anguillarum 775: construction of a recA mutant by marker exchange

Article Abstract:

A Vibrio anguillarum H775-3 recA mutant was constructed by a modified marker exchange technique. Specific mutations were introduced by inserting large segments of homologous DNA carrying the recA gene of V. anguillarum 775 in the chromosomal DNA of V. anguillarum H775-3 thru conjugal mobilization. Unlike its parent, the recA mutant exhibited recombination, suggesting that recA is required for DNA repair in V. anguillarum 775.

Genetic aspects, Marine bacteria, Genetic recombination, Genetic markers

---

Additional evidence that juvenile oyster disease is caused by a member of the Roseobacter group and colonization of nonaffected animals by Stappia stellulata-like strains

Article Abstract:

Results demonstrate that species of the alpha-proteobacteria of the Roseobacter group (CVSP) are the only etiologic agent of the juvenile oyster disease (JOD) epizootic. Animals not exposed to JOD are colonized by Stappia stellulata-like strains. JOD was reproduced under laboratory conditions by exposing Crassostrea virginica cells to CVSP bacteria.

United States, Physiological aspects, Bacterial infections, Communicable diseases in animals, Communicable animal diseases

Similar abstracts:

• Abstracts: Ribosomal DNA internal transcribed spacers to estimate the proportion of Pisolithus tinctorius and Eucalyptus globulus RNAs in ectomycorrhiza
• Abstracts: Bacterial oxidation of dibromomethane and methyl bromide in natural waters and enrichment cultures. Methane and trichloroethylene oxidation by an estuarine methanotroph, Methylobacter sp. strain BB5.1
• Abstracts: Use of unlinked genetic markers to detect population stratification in association studies. Quantitative-trait locus for specific language and reading deficits on chromosome 6p
• Abstracts: Strategies for identification of mutations causing hereditary retinal diseases in dogs: evaluation of opsin as a candidate gene
• Abstracts: Quantitative selective PCR of 16S ribosomal DNA correlates well with selective agar plating in describing population dynamics of indigenous Pseudomonas spp. in soil hot spots

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.