Microbial Contamination and Public Health Analysis

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Introduction
Microbial pollution becomes a primary risk to the general well-being of all members of the population; therefore, there must be an inherent trust in the techniques available to identify the presence of microorganisms in the food and how many there are. This paper will establish the appropriateness of three types of microorganism testing: spread plate, pour plate, and Petrifilm in quantifying the contamination of microorganisms in three food samples: Honey sliced ham (deli), pastrami (deli), and packaged salad. Identification of various microorganisms, including aerobic bacteria, yeast, and mould, along with E. coli, indicators of food safety, is mentioned in the methods. Given that there is a difference in food cooking and treatment, it is believed that the microbial contamination of the packaged salad will be greater than that of the deli meats. This study will likely provide an international evaluation of these testing protocols and form part of a perspective on the viability and fidelity of such tests in food safety analyses in a range of food production.
Results
Table 1
Food Sample Spread Plate (mean cfu/g) Pour Plate (mean cfu/g) Petrifilm Aerobic Count (mean cfu/g) Petrifilm Yeast & Mould (mean cfu/g) Petrifilm E. coli (mean cfu/g)
Honey Sliced Ham (Deli) 1.92E+04 2.13E+03 2.50E+05 7.51E+05 0.00E+00
Pastrami (Deli) 2.13E+03 1.21E+03 9.70E+05 1.98E+04 2.70E+01
Fresh Salad (Packaged) 1.57E+07 4.90E+05 2.52E+06 9.60E+05 2.40E+01

Figure 1

Discussion
Significant Results
The outcome of this analysis shows that there is indeed a difference in the number of microbial contamination between the fresh salad and the deli meats (honey-sliced ham and pastrami). The fresh salad was found to have much greater microbial contamination, and the spread plate technique produced a higher cfu/g of 1.57E +07, and the Petrifilm Aerobic Count gave 2.52E +06. These results highlight the greater vulnerability of less processed foods, such as salad, to the infiltration of microbes (1). Fresh produce is usually exposed to environmental conditions like air, touch, and wrapping, which helps in creating an ideal environment for microbes to thrive. Conversely, the contamination levels in both honey-sliced ham and pastrami were significantly less than in all other tests, especially in the Petrifilm E. coli and Yeast and Mould counts (2). No E. coli could be measured in the ham, and pastrami contained low amounts of levies.
Comparison of Individual and Class Results
Comparing all results to the class results, there was a consistent trend of greater contamination in fresh salad with every method. However, the spread plate technique recorded a very high contamination level of 1.57E + 07 cfu/g in the fresh salad sample. This implies the possibility of a difference in how the samples were treated or processed in the experiment, which might lead to this particular finding being so significant when compared to other tests (3). This variation could be explained by a number of different factors, including the differences in how the salad was handled before testing, a variation in storage of the samples, or even an inconsistency in how they were inoculated. In spite of these possible discrepancies, the general tendency was evident, and the fresh salad had demonstrated much higher rates of contamination than the deli meat on a regular basis, as expected.
Unexpected Results and Justifications
The lack of E. coli in the honey-sliced ham became one of the unforeseen results of this experiment. Considering the fact that the production of deli meats is commonly accompanied by the idea of potential contamination threat in the process of handling, storage, or contamination of the food in the course of processing, it was expected to have certain traces of E. coli (4). Absence of E. coli in this sample actually means that the preservation processes applied in the deli meats, such as curing, refrigeration, and perhaps some antimicrobial treatment methods, were essentially effective in silencing the harmful bacteria growth (6). Such preservation measures as are often used within food processing to ensure that food has a longer shelf life and that it does not spoil probably played a vital role in managing bacterial contamination in the honey-sliced ham (5). Moreover, although pastrami did contain low concentrations of E. coli (2.70E+01 cfu/g), it was otherwise relatively low compared to other types of foods, which usually tend to have more pathogens (7). The other unexpected outcome was that both deli meats contained yeast and mould; in the honey-sliced ham, 7.51E+05 cfu/g yeast and mould were found.
Summary
In conclusion, microbial contamination of honey-sliced ham, pastrami, and fresh salad was evaluated under the conditions of spread plate, pour plate, and the Petrifilm system, which were used to test aerobic bacteria, yeast, and mould, as well as E. coli. The findings indicated that fresh salad recorded the overall highest number of microorganisms of all the practices, which were used under the influence of little processing, handling, and exposure to microorganisms. On the other hand, the deli meats were found to pose a lesser microbial load, and the E. coli was not present in the honey-sliced ham, indicating that preservation and processing cannot be considered effective in the reduction of bacterial contamination. The natural growth of yeast and mould on deli meat is important to highlight the fact that, even after subjecting these products to these forms of preservation, non-bacterial microorganisms may still be living. Emphasizing the importance of the cleaning process, storage, and any hygiene measures, particularly with regard to minimally processed foods, in the process of ensuring consumer protection.

 

Bibliography
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Tropea A. Microbial Contamination and Public Health: An Overview. International Journal of Environmental Research and Public Health [Internet]. 2022 Jun 17;19(12):7441. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9224327/
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Barbosa JB. Microbial Contamination and Food Safety (Volume I). Biology [Internet]. 2025 Jan 13;14(1):59–9. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC11761847/
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Urban-Chmiel R, Osek J, Wieczorek K. Methods of Controlling Microbial Contamination of Food. Pathogens [Internet]. 2025 May 16 [cited 2025 Jun 7];14(5):492. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC12114859/
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Tarfeen N, Nisa KU, Hamid B, Bashir Z, Yatoo AM, Dar MA, et al. Microbial Remediation: A Promising Tool for Reclamation of Contaminated Sites with Special Emphasis on Heavy Metal and Pesticide Pollution: A Review. Processes. 2022 Jul 12;10(7):1358.
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Robakowska M, Bronk M, Tyrańska-Fobke A, Ślęzak D, Kraszewski J, Balwicki Ł. Patient Safety Related to Microbiological Contamination of the Environment of a Multi-Profile Clinical Hospital. International Journal of Environmental Research and Public Health [Internet]. 2021 Apr 6;18(7):3844. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8038759/
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Milka Malešević, Branko Jovčić. Targeting Gram-Negative Bacterial Biofilm with Innovative Therapies: Communication Silencing Strategies. Future Pharmacology [Internet]. 2025 Jul 3 [cited 2025 Aug 31];5(3):35–5. Available from: https://www.mdpi.com/2673-9879/5/3/35
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Juszczuk-Kubiak E. Molecular Aspects of the Functioning of Pathogenic Bacteria Biofilm Based on Quorum Sensing (QS) Signal-Response System and Innovative Non-Antibiotic Strategies for Their Elimination. International Journal of Molecular Sciences [Internet]. 2024 Feb 24;25(5):2655. Available from: https://pubmed.ncbi.nlm.nih.gov/38473900/

 

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