The microbial quality, pH and presence of selected pathogens in milk at eight collection centers in Trinidad were determined.
The enterotoxigenicity and susceptibility of Staphylococcus aureus strains to antimicrobial agents and bacteriophages were investigated while the antibiograms and ability of Escherichia coli isolates to agglutinate O157 antiserum were also assessed.
Of the 287 milk samples tested, the mean pH was 6.80±0.10 and 207 (72.1%) were California mastitis test (CMT) positive.
All (100.0%) milk samples contained S. aureus, and 217 (75.6%) were positive for E. coli.
The ranges of mean counts per ml for total aerobic bacteria, S. aureus and E. coli were 3.3 Y 106 to 9.8 Y 107,1.4 Y 104 to 1.2 Y 105 and 4.2 Y 104 to 1.6 Y 106, respectively.
Ninety-three (40.4%) of 230 strains of S. aureus tested were enterotoxigenic producing staphylococcal enterotoxins A, B, C, D or a combination with SEC being predominantly elaborated.
Of the 245 strains of S. aureus phage-typed, 123 (50.2%) were susceptible to international phage set (IPS) of bacteriophages.
Overall, 49 (49.0%) of 100 strains of S. aureus tested were resistant to 1 or more of the 8 antimicrobial agents with resistance high to penicillin (48.0%), ampicillin (45.0%) and methicillin (21.0%). Among 100 strains of E. coli tested, 98 (98.0%) exhibited resistance to antimicrobial agents with high prevalence of resistance detected for cephalothin (79.0%), ampicillin (73.0%) and streptomycin (47.0%).
Mots-clés Pascal : Sensibilité résistance, Antimicrobien, Antilles, Amérique Centrale, Amérique, Lait vache, Qualité, Contamination biologique, Staphylococcus aureus, Micrococcaceae, Micrococcales, Bactérie, Escherichia coli, Enterobacteriaceae, Pathogène, Glande mammaire pathologie, Lait cru, Trinidad Tobago, Souche entérotoxigène
Mots-clés Pascal anglais : Sensitivity resistance, Antimicrobial agent, West Indies, Central America, America, Cow milk, Quality, Biological contamination, Staphylococcus aureus, Micrococcaceae, Micrococcales, Bacteria, Escherichia coli, Enterobacteriaceae, Pathogenic, Mammary gland diseases
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0253778
Code Inist : 002A35B04. Création : 01/03/1996.