Screening for genes Encoding Virulence Factor in Salmonella serovar Typhimurium isolated from Tiger nut Juice

Peter IU; Ogbonna IP; Edemekong CI; Okolo IO; Mohammed ID

doi:10.61386/imj.v17i3.480

Authors

Peter IU Department of Public Health, Faculty of Health Technology and Engineering, Federal University of Allied Health Sciences, Trans-Ekulu, P.M.B. 01473, Enugu, Nigeria
Ogbonna IP Department of Microbiology and Parasitology, David Umahi Federal University of Health Science, Uburu, P.M.B. 8211, Ebonyi State, Nigeria
Edemekong CI Department of Biotechnology, Faculty of Pure and Applied Sciences, Federal University of Allied Health Sciences, Trans Ekulu, P.M.B. 01473, Enugu, Nigeria
Okolo IO Department of Applied Science, Faculty of Pure and Applied Sciences, Federal University of Allied Health Sciences, Trans Ekulu, P.M.B. 01473, Enugu, Nigeria
Mohammed ID Department of Nursing Science, Faculty of Health Sciences, Federal University Lokoja, , P.M.B. 1154, Kogi Nigeria

DOI:

https://doi.org/10.61386/imj.v17i3.480

Keywords:

Tiger nut, juice, Salmonella Typhimurium, Virulence, Gene

Abstract

Background: Tiger nut juice is a popular non-alcoholic beverage in Nigeria, but it can be contaminated with bacteria that pose a risk to consumers. A study in Ogbete market, South Eastern Nigeria, aimed to identify virulence genes in Salmonella enterica subsp. enterica serovar Typhimurium found in tiger nut juice to assess the potential health threat.

Materials and Methods: Fifty tiger nut juice with codes ATC1, MECB2, BNC3, CHA4, ERT5, TYR6, VMA7, EKA8, TMM9, and ORU10 were randomly purchased from Ogbete market vendors. Standard microbiological techniques and Polymerase Chain Reaction (PCR) were used to screen the samples for S. Typhimurium presence and its virulence genes including invA, spvB, pefA, csgA, orgA, msgA, spaN, spiA, spvC, sipB, and sefA.

Results: Our study found that 48.0% of the samples tested positive for S. Typhi. S. Typhi positive culture rates varied by sample location: ATC1 (10%), MECB2 (4.0%), BNC3 (6.0%), CHA4 (2.0%), ERT5 (8.0%), TYR6 (0.0%), VMA7 (6.0%), EKA8 (0.0%), TMM9 (8.0%), ORU10 (6.0%). PCR amplification of the virulence gene showed the presence of invA, spvB, pefA and csgA in all isolates. S. Typhimurium isolates from samples TYR6, VMA7, EKA8, TMM9, and ORU10 lacked orgA and msgA genes. Other virulence genes identified include spaN (40-100%), spiA (40-100%), spvC (25-100%), sipB (20-100%), and sefA (100%).

Conclusion: Our findings reveal that tiger nut juice contained Salmonella Typhimurium harboring numerous virulence genes. Therefore, to prevent the general public's health from being harmed by tiger nut drinks contaminated with Salmonella Typhimurium, relevant regulatory bodies should enforce strict hygienic practices during the production, handling, and distribution of tiger nut juice.