Abstract
ABSTRACTMethicillin-resistant Staphylococcus aureus (MRSA) is a bacterium that is resistant to a large group of beta-lactam antibiotics. Rhazya stricta is a local shrub that grows naturally as a normal flora and is used as a medicinal plant by several nations for a lot of infectious diseases, caused by microorganisms. Therefore, the effect of the plant against different genotypes of methicillin-resistant S. aureus was tested in the present study. Molecular identification was done for the medical sampling of 44 MRSA and biodiversity approaches were applied to detect the mecA gene. The 16S rRNA genes analysis was performed for the construction of a phylogenetic tree. Later on, the antimicrobial effect of the plant leaves’ water extract was tested on different genotypes. MecA gene appeared in all isolates, except in methicillin-susceptible Staphylococcus aureus. The selected MRSA 16S rRNA sequences were sent to GenBank and six accession numbers (KM893010, KM893011, KP091274, KP091275, KP137513 and KP137514) were acquired. Also, an evolutionary analysis of these strains was done and a phylogenetic tree was constructed. Plant extracts showed that the interaction between pathogens and drugs is more efficient in a liquid environment than in a solid one.
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