In recent years there has been a growing interest in hazards having a microbiological source, resulting from the direct transmission of microorganisms from the natural environment, which may result in inducing diseases in people and animals. This study aimed at determining the survival of pathogenic bacteria Listeria monocytogenes in water and sewage from the meat industry plant, depending on diversified temperature conditions, as well as the assessment of sanitary and epidemiological risks resulting from the ability of determined microorganisms to live in a water environment. On the basis of our research, it was found that Listeria monocytogenes showed the longest survival time both in water and sewage at 4oC, where the maximal survival time of those microorganisms determined on the basis of the regression analysis amounted to 120 and 141 days, respectively. The results obtained in the experiment present important data concerning the survival of the bacteria Listeria monocytogenes in sewage and the water environment, and at the same time they draw attention to the need for a constant monitoring of effluents from the meat industry plant, as well as the surface waters within the range of influence of those facilities on pathogenic and potentially pathogenic microorganisms.

Survival time of bacteria Listeria monocytogenes in water environment and sewage

Milk and dairy products are considered as important food for high risk group of people as elderly, pregnant women, newborns, and immunocompromised individuals and these products are good vehicles for Listeria organisms. This work was carried out to study the occurrence of Listeria monocytogenes in milk and cheese samples, animal and human samples in Cairo and Giza governorates. In order to study the occurrence of Listeria monocytogenes, a total of 963 samples were collected in Cairo and Giza governorates. They included 157 milk samples purchased from dairy shops, 162 milk samples collected from farms, 68 cheese samples purchased from dairy shops and street vendors, 504 fecal samples from farm ruminants, and 72 stool samples from humans, the occurrence of Listeria monocytogenes was 2.55 %, 0.62 %, zero, 0.20 % and 1.39 % respectively. For easy, rapid and efficient methods of isolating and identifying L. monocytogenes, both standard culture and PCR based techniques have been employed.

Public health significance of listeria monocytogenes as a food - borne pathogen

The study was carried out during the period extended from September 2018 to February 2019 at El-Menoufia Governorate to investigate the presence of Listeria species in some food sources as well as aborted women. A total of 250 different samples were collected including; milk (100), kariesh cheese (25), beef meat (25), hot dog (25) and Bolti fish (25). Moreover, 50 vaginal swabs were collected from 50 aborted women from El-Menoufia University Hospital and Shibin El-Kom Teaching Hospital. The obtained results in the current work showed that the highest rate of isolation of Listeria spp. was recorded in the examined samples of Bolti fish (40%), followed by beef meat (28%) then raw milk (25%), Hot dog (24%) and finally kariesh cheese (20%) with statistically significant association between these rates of isolation. In addition, distribution of Listeria spp. isolated from raw milk samples clarified the identification of L. monocytogenes (2%), L. ivanovii (7%), L. innocua (5%), L. seeligeri (6%) and L. murrayi (5%), distribution of Listeria spp. isolated from kariesh cheese samples clarified the identification of L. monocytogenes (4%), L. ivanovii (8%), L. innocua (4%), and L. seeligeri (4%), distribution of Listeria spp. isolated from beef meat samples clarified the identification of L. monocytogenes (8%), L. ivanovii (4%), L. innocua (4%), L. seeligeri (4%) and L. welshimeri (8%), distribution of Listeria spp. isolated from Hot dog samples clarified the identification of L. monocytogenes (4%), L. ivanovii (8%) and L. welshimeri (12%) and finally, distribution of Listeria spp. isolated from Bolti fish samples clarified the identification of L. monocytogenes (4%), L. ivanovii (12%), L. innocua (4%), L. seeligeri (4%) and L. welshimeri (16%). On the other side, the rate of isolation from vaginal swabs of aborted women was 16% and distribution of Listeria spp. clarified the presence of L. monocytogenes (4%), L. ivanovii (4%), L. seeligeri (2%), L. grayi (2%), L. welshimeri (2%) and L. innocua (2%). Finally, PCR was applied successfully to detect LM1 gene in identification of isolates of L. monocytogenes. The recorded results in the current study throw the light upon the zoonotic potential of L. monocytogenes in El Menoufia Province where investigated samples were found to be positive for presence of Listeria with different rates that could ring the hazard bell about the significant role of different food products in transmitting these organisms to pregnant women. Moreover, PCR is a useful diagnostic tool for detection of L. monocytogenes because it sensitive and specific so this technique should be adopted as a complementary tool to conventional tests.

Possible Food Sources of Listeriosis for Aborted Women in Menoufia Province

Molecular aspects of Listeria monocytogenes pathogenicity.

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Molecular aspects of Listeria monocytogenes pathogenicity.