Alterations in virulence and antibiotic resistant genes of multidrug-resistant Salmonella serovars isolated from poultry: The bactericidal efficacy of Allium sativum

•13 Salmonella serovars isolated and identified from diseased chickens.•Virulence and antibiotic resistance genes were determined by PCR.•The highest biofilm density observed in S. takoradi and S. Apeyeme.•All isolates were multi-resistant against most of B-lactams groups.•The efficiency of garlic extract was assessed (in vitro and in vivo).

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