Bacterial strains
Pathogenic bacterial strains such as E. coli (ATCC2592), Salmonella typhi (ATCC9289) (S. typhi), Staphylococcus aureus (ATCC2923) (S. aureus), Pseudomonas aeruginosa (ATCC27853) (P. aeruginosa) and Klebsiella pneumonia (ATCC7000603) (K. pneumonia) were obtained from Gondar College of Medical Science, University of Gondar