Microbiological quality of blue mussels (Mytilus edulis) in Nunavik, Quebec: a pilot study

2010 ◽  
Vol 56 (11) ◽  
pp. 968-977 ◽  
Author(s):  
Benoît Lévesque ◽  
Christine Barthe ◽  
Brent R. Dixon ◽  
Lorna J. Parrington ◽  
Daniel Martin ◽  
...  
Keyword(s):  
Pilot Study ◽  
Toxoplasma Gondii ◽  
Mytilus Edulis ◽  
Clostridium Perfringens ◽  
Microbiological Quality ◽  
Molecular Methods ◽  
Fecal Indicators ◽  
Salmonella Spp ◽  
Blue Mussels ◽  
Cryptosporidium Spp

This pilot study was aimed at documenting the presence of fecal indicators and enteric pathogens in blue mussels ( Mytilus edulis ) from 6 communities in Nunavik, Quebec. One to four 2 kg samples of mussels were collected at low tide in each community. Samples were investigated by enumeration methods for the fecal indicators enterococci, Escherichia coli , F-specific coliphages, Clostridium perfringens , and by molecular identification for the pathogens norovirus, Salmonella spp., Campylobacter jejuni , Campylobacter coli , and Campylobacter lari , verocytotoxin-producing E. coli (particularly serovar O157:H7), Shigella spp., and Yersinia enterocolitica . In 5 communities, the presence of Giardia duodenalis and Cryptosporidium spp. was also tested by microscopy and molecular methods and that of Toxoplasma gondii was tested by molecular methods. Apart from small quantities of Clostridium perfringens in 2 samples, no bacterial or viral pathogens were detected in the mussels. Toxoplasma gondii was also not detected. However, G. duodenalis and Cryptosporidium spp. were present in 18% and 73% of the samples investigated for these pathogens, respectively. When considering the indicators and the viral and bacterial pathogens investigated, the mussels examined were of good microbiological quality, but considering the presence of potentially zoonotic protozoa, it should be recommended that consumers cook the molluscs well before eating them.

Microbiological Quality of Blue Mussels (Mytilus edulis) in Nunavik (Canada): A Pilot Study

Epidemiology ◽  
2007 ◽  
Vol 18 (Suppl) ◽  
pp. S31-S32
Author(s):  
B Lévesque ◽  
É Lavoie ◽  
M Simard ◽  
C Barthe ◽  
B Dixon
Keyword(s):  
Pilot Study ◽  
Mytilus Edulis ◽  
Microbiological Quality ◽  
Blue Mussels

Pre-exposure to Cu2+ and CuO NPs leads to infection of caged blue mussels, Mytilus edulis L., by pathogenic microalga: Pilot study in the Lower St. Lawrence Estuary (Québec, Canada)

2021 ◽  
Vol 166 ◽  
pp. 112180
Author(s):  
Michael Zuykov ◽  
Galina Kolyuchkina ◽  
Graeme Spiers ◽  
Michel Gosselin ◽  
Philippe Archambault ◽  
...  
Keyword(s):  
Pilot Study ◽  
Mytilus Edulis ◽  
Lawrence Estuary ◽  
Blue Mussels ◽  
Cuo Nps ◽  
St Lawrence Estuary

Toxoplasma gondii and Other Zoonotic Protozoans in Mediterranean Mussel (Mytilus galloprovincialis) and Blue Mussel (Mytilus edulis): A Food Safety Concern?

2019 ◽  
Vol 82 (3) ◽  
pp. 535-542 ◽  
Author(s):  
TIZIANA TEDDE ◽  
MARIANNA MARANGI ◽  
ROBERTO PAPINI ◽  
SARA SALZA ◽  
GIOVANNI NORMANNO ◽  
...  
Keyword(s):  
Toxoplasma Gondii ◽  
Mytilus Edulis ◽  
Mytilus Galloprovincialis ◽  
Blue Mussel ◽  
Safety Concern ◽  
Giardia Duodenalis ◽  
Cryptosporidium Spp ◽  
Retail Outlets ◽  
Mediterranean Mussel ◽  
Foodborne Infection

ABSTRACT Mediterranean mussels (Mytilus galloprovincialis) and blue mussels (Mytilus edulis) are among the most consumed fishery products, but they are frequent vehicles of foodborne infection worldwide. In this study, we investigated the occurrence and seasonality of zoonotic protozoans in mussels farmed or sold at retail outlets in Italy. We collected and tested 1,440 M. galloprovincialis and 180 M. edulis. Pooled samples were molecularly tested for Giardia duodenalis, Cryptosporidium spp., and Toxoplasma gondii and then sequenced. Sixty-two (45.9%; 95% confidence interval, 37.5 to 54.3%) mussel pools tested positive for one or more of the investigated pathogens. Both Mytilus species and samples from all the investigated areas harbored pathogens. Mussels were statistically more contaminated by Cryptosporidium spp., followed by T. gondii and G. duodenalis assemblage A, and M. galloprovincialis was more contaminated than M. edulis (P < 0.01). Contamination was more likely in mussels at retail outlets (P < 0.05) than in those from farms and in mussels collected in spring (P < 0.01) than in other seasons. This is the first report of T. gondii found in M. galloprovincialis in Italy and in M. edulis in Europe. The detection of zoonotic protozoans in a widely consumed food source indicates the need for a more detailed microbiological risk analysis, especially considering that bivalve mollusks are often consumed raw worldwide.

scholarly journals Microbiological quality of honey from stingless bee, jandaíra (Melipona subnitida), from the semiarid region of Brazil

2018 ◽  
Vol 48 (9) ◽  
Author(s):  
Carolina de Gouveia Mendes da Escóssia Pinheiro ◽  
Maria Rociene Abrantes ◽  
Rodrigo Otávio Silveira Silva ◽  
Carlos Augusto Oliveira Junior ◽  
Francisco Carlos Faria Lobato ◽  
...  
Keyword(s):  
Clostridium Perfringens ◽  
Microbiological Quality ◽  
Stingless Bee ◽  
Semiarid Region ◽  
Salmonella Spp ◽  
Mesophilic Bacteria ◽  
Melipona Subnitida ◽  
Bacillus Spp ◽  
Staphylococcus Spp

ABSTRACT: The aim of this study was to evaluate the presence of microorganisms in honey produced by the stingless bee (SB) jandaíra (Melipona subnitida) from the semiarid region of Brazil. Thirty-five samples were analyzed and all of them were positive for mesophilic bacteria, coliforms at 45°C, fungi, and yeast. Staphylococcus spp. were identified in 85.7%, while Bacillus spp. were detected in 34.3% of honey samples. DNAs of Clostridium perfringens and C. botulinum were detected in 40% and 2.8% of the samples, respectively. Salmonella spp. and C. difficile were not detected. The present research revealed a great diversity of microorganisms in honey produced by jandaíra.

scholarly journals Modification of microbiological quality and valorization of different ruminants species ruminal content in farm animals feeding

2021 ◽  
Vol 78 (2) ◽  
pp. 37
Author(s):  
Yamouna BARA ◽  
Rafik ARBOUCHE ◽  
Abdelhamid BAA ◽  
Adel MAMMERI
Keyword(s):  
Staphylococcus Aureus ◽  
Clostridium Perfringens ◽  
Microbiological Quality ◽  
Domestic Animal ◽  
Farm Animals ◽  
Rumen Content ◽  
Microbiological Analysis ◽  
Salmonella Spp ◽  
Total Coliforms ◽  
Yeasts And Molds

This study is based on the microbiological analysis of a common slaughterhouse by-product which is the rumen content, before and after treatment with HCl 1N, targeting its valorization in domestic animal feeding. A total of 24 rumen content samples were collected in pairs (two series) immediately after slaughter from 12 ruminants (cattle, sheep and goats). The first series was not treated with HCl (N0 = 12), while the second series was treated with HCl 1N (N1 = 12) to adjust its pH to about 2. Then all samples (series 1 and 2) were subject to a group of microbiological analyzes targeting identification and enumeration of total aerobic mesophilic flora; fecal and total coliforms; Clostridium perfringens; Staphylococcus aureus; Salmonella spp. as well as yeasts and molds. The results revealed that after lowering the pH to about 2, the 2nd series samples were considered of satisfactory quality, with reference to Algerian microbiological standards for livestock feeds. The reduction rates of germs in the 2nd series compared to the 1st series were as follows: total aerobic mesophilic flora (86.45%), total coliforms (96.43%), faecal coliforms (70.41). %), Clostridium perfringens (88.4%), yeast and mold (87.75%). The total absence of Staphylococcus aureus and Salmonella spp. was registered.

Macrophyte-derived detritus in shallow coastal waters contributes to suspended particulate organic matter and increases growth rates of Mytilus edulis

2020 ◽  
Vol 644 ◽  
pp. 91-103
Author(s):  
D Bearham ◽  
MA Vanderklift ◽  
RA Downie ◽  
DP Thomson ◽  
LA Clementson
Keyword(s):  
Organic Matter ◽  
Mytilus Edulis ◽  
Particulate Organic Matter ◽  
Coastal Waters ◽  
Gill Tissue ◽  
Suspension Feeder ◽  
Food Sources ◽  
Suspension Feeders ◽  
Blue Mussels ◽  
Suspended Particulate

Benthic suspension feeders, such as bivalves, potentially have several different food sources, including plankton and resuspended detritus of benthic origin. We hypothesised that suspension feeders are likely to feed on detritus if it is present. This inference would be further strengthened if there was a correlation between δ13C of suspension feeder tissue and δ13C of particulate organic matter (POM). Since detritus is characterised by high particulate organic matter (POC):chl a ratios, we would also predict a positive correlation between POM δ13C and POC:chl a. We hypothesised that increasing depth and greater distance from shore would produce a greater nutritional reliance by experimentally transplanted blue mussels Mytilus edulis on plankton rather than macrophyte-derived detritus. After deployments of 3 mo duration in 2 different years at depths from 3 to 40 m, M. edulis sizes were positively correlated with POM concentrations. POC:chl a ratios and δ13C of POM and M. edulis gill tissue decreased with increasing depth (and greater distance from shore). δ13C of POM was correlated with δ13C of M. edulis. Our results suggest that detritus comprised a large proportion of POM at shallow depths (<15 m), that M. edulis ingested and assimilated carbon in proportion to its availability in POM, and that growth of M. edulis was higher where detritus was present and POM concentrations were higher.

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