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Adult female and juvenile ranch mink were fed rations containing 50 and 75% of fish containing 0.44 ppm total mercury over a 145 day period. There was no clinical or pathological evidence of intoxication in these animals and mercury concentrations in tissue appeared to be at a level below that associated with toxicity.
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A confirmed diagnosis of human fascioliasis was rare in Vietnam until 1978 when two cases were reported in humans. Since 1997, we have confirmed 500 cases of human fascioliasis. The majority of cases come from the central provinces of Vietnam: Da Nang, Quang Ngai, Binh Dinh, Phu Yen and Khanh Hoa. Patients were treated in hospitals in Ho Chi Minh City. All had high peripheral blood eosinophilic counts (16-70%) and positive serology with Fasciola gigantica antigen with positive titers of 1/1,600 to 1/12,800. We are unsure whether this represents an endemic pattern of disease or whether improved specific laboratory tools now facilitate better diagnosis. It is also possible that with changes in environmental factors and in the number and breeds of herbivorous domestic animals, Fasciola is increasing in frequency and easily contaminates the food.
The monitoring of a HACCP (Hazard Analysis Critical Control Point) plan for the Listeria monocytogenes control in the cooked and frozen meat section of a thermo-processing meat plant was evaluated. Seventy "non-product-contact" surface samples and fourteen finished product samples were examined. Thirty eight positive sites for the presence of Listeria sp. were obtained. Twenty-two isolates were identified as L. monocytogenes, two as L. seeligeri and fourteen as L. innocua. Non isolates were obtained from finished product samples. The detection of L. monocytogenes in cooked and frozen meat section environment showed the need for the HACCP plan to eliminate or prevent product contamination in the post-thermal step.
The microbiological quality of 4 feed ingredients and 29 hospital-prepared non-sterile enteral feeds were determined. All 4 feed ingredients yielded no growth of micro-organisms, but all 29 enteral feeds had aerobic viable counts exceeding 10(5) organisms g-1 with a high coliform count in each feed. Both the aerobic palte count and the coliform count exceeded numerical limits for micro-organisms in enteral feeds. Sources of contamination were the feed containers and the liquidizer which were inadequately disinfected.
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Some bacteria of the genus Clostridium can contaminate milk. These bacteria can cause "the late gas" or "late blowing" defect in the cheese if this is made with milk containing such contaminants. In this study, six samples from a processed cheese contaminated in a manufacturing machine were analysed. Out of 60 strains studied, 30 were classified as Clostridium tyrobutyricum, 20 as Clostridium butyricum, and 10 as Desulfotomaculum ruminis.