Isolation of Diarrhea Causing Organisms (Salmonella and Shigella) from Selected Seafood

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Owhorchukwu Amadi- Wali
Chinyere Amadi- Wali
Allwell Sunny Njigwum


Aims: The study investigated the presence of entities causing diarrhea (Shigella & Salmonella) from some selected seafood.

Study Design:  The study adopted a completely randomized experimental Design.

Place and Duration of Study: Department of Medical Microbiology, Rivers State University Teaching Hospital (RSUTH), between January 2020 and February 2020.

Methodology: Simple random technique was employed to collect sufficient quantities of five different fresh raw seafoods (shrimp, periwinkle, crab, sardine fish and mudskipper) across fish harbors and fish markets (Nembe waterside, Abonema Wharf and 1 Fish Market) in Port Harcourt, and were evaluated for bacteriological quality. Sample collection was a cross-sectional type. The isolation and identification of isolates were done according to standard bacteriological analytical methods. The study employed Frequency counts, percentages and one- way ANOVA statistics, and the analysis was done using SPSS version 23. Although, one-way ANOVA statistics was used to test the hypothesis of the study at 0.05 level of significance, while Tukey’s test was used for ranking means.

Results: The finding showed that 53 percent of the isolates (i.e. 8 out of 15 isolates) were characterized as Salmonella and Shigella. Also, the result shows that all the seafood evaluated contain unacceptable levels of Salmonella and Shigella contamination, which ranged from 1.79 x107 CFU/g to 2.96 x107CFU/g. The level of contamination found in the selected seafood is shown in descending order from the highest to the lowest: Sardine> Periwinkle> Shrimps> Mudskipper> Crab. More so, result from the hypothesis showed that there was a significant mean difference in the Salmonella and Shigella count amongst selected seafood (P < .001).

Conclusion: The results of this study constitute an indicator of fecal contamination in selected seafood from fish markets in Port Harcourt. Amongst others, it was recommended that Government should enforce laws discouraging the dumping of untreated waste into water bodies.

Diarrhea, Salmonella, Shigella and seafood.

Article Details

How to Cite
Wali, O. A.-, Wali, C. A.-, & Njigwum, A. S. (2020). Isolation of Diarrhea Causing Organisms (Salmonella and Shigella) from Selected Seafood. International Journal of TROPICAL DISEASE & Health, 41(17), 1-8.
Original Research Article


Heinitz ML, Ruble RD, Wagner DE, Tatini SR. Incidence of salmonella in fish and seafood, Journal of Food Protection. 2000; 63:579-592.

Novotny L, Dvorska L, Lorencova A, Baran V, Pavlik I. Fish: A potential source of bacterial pathogens for human beings, Vet. Med,-Czech. 2004;49(9):343-358.

Metz H. Water as a Vector of Infection: Water-borne Bacteria (in German), Zentralbl. Bacteriol. Microbiol. Hyg. 1980;(B):172:255-274.

Minelte HP. Salmonelosis in the Marine Environment. A Review and Commentary. International Journal Zoonoses. 1986;13: 71-75.

Chattopadhyay P. Fish-catching and Handling. In: Robinson R.K. (ed): Encyclopedia of Food Microbiology. Academic Press, London. 2000;2:1547.

Fell G, Hammond O, Linder,s. Rehmet R, Liesgang A, Prayer R, Gericke B, Peterson I. An outbreak of salmonella blockey infection following smoked eel consumption in Germany. Epidemiology Infection. 2000;125:9-12.

Senanayake SN, Ferson MJ, Botham SJ, Belinfante RT. A child with salmonella enteric serotype paratyphi b infection acquired from a fishtank, Med. J. Australia. 2004;180:250.

Kumar R, Sven Surendran PK, Thampuran N. Distribution and genotypic characterization of salmonella serovars Applied Microbiology. 2009;106:515-524.

Animashaun T, Odugbemi T. Observation on In-vitro Activities of chloramphenicol, co-trimoxazole and of loxacin against salmonella. Nig. Med. Pract. 1991;21(3-4):37-38.

Boomsma LJ. Clinical aspects of typhoid fever in two rural Nigerian hospitals: A prospective study. Trop. Geor. Med. 1988; 40:97-102.

Onile BA, Odugbemi T. Salmonella serotype in Ilorin, Nigeria. West African Journal Med. 1987;6:7-10.

Chawla D, Sondhi N. Research Methodology: Concept and Cases, Vikas Publishing House. 2014;670.

Cheesbrough M. District Laboratory Practice in Tropical Countries Part 2 (Cambridge Low-price ed.) Cambridge University Press, UK. 2004;178-194.

Wandili SA, Onyango DM, Windy NE. Characterization of Salmonella Isolated from Nile Tilapia (Oreochromis Niloticus) Along Lake Victoria Beaches in Western Kenya, International Journal of Biology And Med. Sci. 2011;1(1):51-56.

Elhadi N, Aljeldah M, Aljindan R. Microbiological contamination of imported frozen fish marketed in Eastern Province of Saudi Arabia. International Food Research Journal. 2016;23(6):2723-2731.

Adedeji OB, Ibrahim SO. Assessment of microbial safety of fresh shrimps offered for sales at alesinloye and eleyele markets in Ibadan, Southwestern Nigeria, J. Appl. Sci. in Envtal. Sanitation. 2011;6(3):239-246.

Bukola CA, Abiodun AO, Adeniyi AO, Damilola OA. Bacteriological and proximate analysis of periwinkles from two different creeks in Nigeria, World Applied Sciences Journal. 2006;1(2):87-91.

FDA. Sanitation of shellfish. In: ahmed, F.E. (ed.) Growing Area and Seafood safety. US Food and Drug Administration, National Academic Press, Washington D.C; 1991.

ICMSF. Microorganisms in Food 1: Their significance and methods of enumeration (2nd ed.) international commission of microbiological specification for food, University of Toronto Press, Toronto. 1982;19-30.

Talaro KP. Foundations in Microbiology (6th Ed.) McGraw-Hill, Boston. 2008;605-616.

Brooks GF, Carroll KC, Butel JC, Morse SA. Jawetz, melnick & adelberg’s medical microbiology (24th ed.) McGraw-Hill Co., New York. 2007;250-261.

Esomunu OC, Abanobi OC, Ihejirika CE. Enteric Pathogens and Diarrhea Diseases Potential of Water Sources and Epidemiology. 2012;4(2):39-43.