Plasmid Curing of Bacteria Isolated from Upper Respiratory Tract Infections among Patients Attending Specialist Hospital Sokoto

Abstract

Presence of resistant plasmids (R-plasmids) in microorganisms makes the cells avert the effect of antibiotics and complicates chemotherapy of infections. This study aimed to cure the plasmid of antibiotic-resistant bacteria associated with upper respiratory tract infections among patients attending Specialist Hospital Sokoto by reassessing their susceptibility to antibiotics that were previously resistant. One hundred (100) throat swab samples were collected and analyzed. The isolates were isolated and identified using standard methods (Gram staining, biochemical, and serological tests). The susceptibility of the isolates to various beta-lactam antibiotics was evaluated, and resistant bacteria were subjected to plasmid curing experiments followed by further susceptibility testing to reassess their susceptibility to the erstwhile resistance. Bacteria isolated were Staphylococcus aureus, Streptococcus pyogenes, and Pseudomonas aeruginosa, with the frequency of occurrence of 20 (57.2%), 9 (25.7%), and 6 (17.1%), respectively. The result of antibiotic susceptibility tests before plasmid curing showed that Staphylococcus aureus, Streptococcus pyogenes, and Pseudomonas aeruginosa resisted Cloxacilline, Cefuroxime, Cloxacillin, and Augmentin. Susceptibility results after curing showed that almost all bacteria have reverted to sensitivity to all antibiotics except Cloxacillin and Augmentin. This research implies that the resistance possessed by the bacterial isolates is plasmid-mediated and may easily be transferred to other non-resistant bacteria, which may lead to an alarming rate of antimicrobial resistance in the study area.