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[Evaluation of the immunochromatography kit for detection of emetic-toxin producing Bacillus cereus]
Motokazu Nakayama1, Takashi Miyashita, Kouichi Hosoya
1Kao Corporation, 2606 Akabane, Tochigi, Japan.
Abstract:
We evaluated the sensitivity and specificity of an immunochromatography kit, Single-path Emetic Tox Mrk (Merck), which targets a marker protein for the detection of Bacillus cereus that produces emetic toxin. Strains were isolated after outbreaks of food poisoning, and from retail prepared foods and food products. The strains were examined for the presence of the emetic toxin-synthetase gene by PCR. All 58 emetic strains isolated from the food poisoning cases showed a positive reaction in the immunochromatography kit. No emetic strains gave false negative result. Among 47 non-emetic strains, only two strains isolated from the food poisonings and one strain isolated from food products showed a false positive reaction in the test. We concluded that this method has high sensitivity and specificity. The test can be used for detection of emetic toxin-producing B. cereus not only from food poisoning cases, but also in food products.
Insights
A new immunochromatography kit accurately detects Bacillus cereus strains that produce emetic toxin. This test shows high sensitivity and specificity for identifying emetic toxin-producing Bacillus cereus in food poisoning cases and food products.
Area of Science:
- Food Microbiology
- Diagnostic Test Development
- Bacterial Toxin Detection
Background:
- Bacillus cereus is a common cause of foodborne illness, often associated with emetic toxin production.
- Accurate and rapid detection methods for emetic toxin-producing Bacillus cereus are crucial for public health and food safety.
- Existing detection methods may lack the speed or specificity required for routine food safety monitoring.
Purpose of the Study:
- To evaluate the sensitivity and specificity of the Single-path Emetic Tox Mrk (Merck) immunochromatography kit.
- To determine the kit's efficacy in detecting emetic toxin-producing Bacillus cereus from various sources, including food poisoning outbreaks and retail food products.
- To assess the utility of this kit as a diagnostic tool in food safety applications.
Main Methods:
- Isolation of Bacillus cereus strains from food poisoning outbreaks and retail food products.
- Detection of the emetic toxin-synthetase gene using Polymerase Chain Reaction (PCR) for confirmation.
- Evaluation of the immunochromatography kit's performance against confirmed emetic and non-emetic strains.
Main Results:
- The immunochromatography kit correctly identified all 58 emetic Bacillus cereus strains from food poisoning cases (100% sensitivity).
- No false-negative results were observed for emetic strains.
- A low rate of false positives was recorded: 2 strains from food poisonings and 1 from food products among 47 non-emetic strains (high specificity).
Conclusions:
- The Single-path Emetic Tox Mrk (Merck) immunochromatography kit demonstrates high sensitivity and specificity for detecting emetic toxin-producing Bacillus cereus.
- This rapid test is suitable for identifying Bacillus cereus in both clinical samples from food poisoning incidents and in various food products.
- The kit offers a valuable tool for enhancing food safety surveillance and outbreak investigations related to Bacillus cereus.
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