Evaluation of a Male-Specific DNA Coliphage Persistence Within Eastern Oysters (Crassostrea virginica)

  • David H. KingsleyEmail author
  • Haiqiang Chen
  • Bassam A. Annous
  • Gloria K. Meade
Original Paper


Male-specific coliphages (MSCs) are currently used to assess the virologic quality of shellfish-growing waters and to assess the impact of sewage release or adverse weather events on bivalve shellfish. Since MSC can have either DNA or RNA genomes, and most research has been performed exclusively on RNA MSCs, persistence of M13, a DNA MSC, was evaluated for its persistence as a function of time and temperature within Eastern oysters (Crassostrea virginica). Oysters were individually exposed to seawater containing a total of 1010 to 1012 pfu of M13 for 24 h at 15 °C followed by maintenance in tanks with as many as 21 oysters in continuously UV-sterilized water for up to 6 weeks at either 7, 15, or 22 °C. Two trials for each temperature were performed combining three shucked oysters per time point which were assayed by tenfold serial dilution in triplicate. Initial contamination levels averaged 106.9 and ranged from 106.0 to 107.0 of M13. For oysters held for 3 weeks, log10 reductions were 1.7, 3.8, and 4.2 log10 at 7, 15, and 22 °C, respectively. Oysters held at 7 and 15 °C for 6 weeks showed average reductions of 3.6 and 5.1 log10, respectively, but still retained infectious M13. In total, this work shows that DNA MSC may decline within shellfish in a manner analogous to RNA MSCs.


Bacteriophage Shellfish Virus Oysters 



We wish to thank Gary Richards (USDA, Dover, DE) and Brendan Niemira (USDA, Wyndmoor, PA) for critical reading of the manuscript.


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Copyright information

© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2019

Authors and Affiliations

  1. 1.ARS, Food Safety & Intervention Technologies Research UnitUSDA, Delaware State UniversityDoverUSA
  2. 2.Department of Animal & Food SciencesUniversity of DelawareNewarkUSA
  3. 3.ARS, ERRC, Food Safety & Intervention Technologies Research UnitUSDAWyndmoorUSA

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