Safety Chapter Bioaccumulation and Removal Dynamics of Murine Norovirus in Manila Clams (Venerupis philippinarum) and Mussels (Mytilus galloprovincialis)

  1. D. Polo 3
  2. C. Álvarez 2
  3. J. Díez 1
  4. C. F. Manso 3
  5. M. Angulo 4
  6. M. L. Vilariño 3
  7. S. Darriba 2
  8. A. Longa 1
  9. J. L. Romalde 3
  1. 1 Consello Regulador Denominación de Orixe Mexillón de Galicia, Vilagarcía de Arousa, Spain
  2. 2 INTECMAR (Instituto Tecnolóxico para o Control do Medio Mariño de Galicia), Consellería do Mar. Peirao de Vilaxoán, Vilagarcía de Arousa, Spain
  3. 3 Departamento de Microbiología y Parasitología, CIBUS- Facultad de Biología, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
  4. 4 TRAGSATEC, Pontevedra, Spain
Show affiliations +
Book:
Home Molluscan Shellfish

Publisher: Springer

ISBN: 9789400765870,  9789400765887

Year of publication: 2014

Pages: 165-175

Type: Book chapter

DOI: 10.1007/978-94-007-6588-7 GOOGLE SCHOLAR lock_openOpen access editor

Sustainable development goals

Abstract

This study evaluates and compares the effectiveness of depuration in clams and mussels subjected to bioaccumulation with murine norovirus (MNV-1), as a surrogate for human norovirus. Ten experiments with artificially contaminated shellfish were performed with clams and mussels (five with each species) using 102 pfu of MNV-1/ml seawater. After 24 h of bioaccumulation, molluscs were relocated in an experimental depuration system (with mechanical and biological static filter system, water disinfection by ozone and UV radiation) under an exhaustive control of the physicochemical parameters. Viral contamination was quantified after bioaccumulation and then daily during the depuration period (7 day) by reverse transcription-real time PCR (qRT-PCR) with TaqMan probes. Results showed significant differences in uptake and removal viral rates between clams and mussels. After 24 h of bioaccumulation the average viral uptake for clams and mussels were 6.2 and 5.4 log RNA copies/g digestive tissue (DT) respectively, representing an uptake rate 73.8 % higher in clams. Only three out of five depuration trials with clams showed some reduction in viral quantification. The average reduction in these three trials was 0.5 log units (41.4 % reduction in RNA copies/g DT). Mussels showed viral reduction in all the depuration trials with an average reduction of 0.8 log units (74 % reduction in RNA copies/g DT).