Microbiological Profile and Antibiotic Sensitivity of 100 Cases of Otitis Externa
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ORIGINAL ARTICLE
Microbiological Profile and Antibiotic Sensitivity of 100 Cases of Otitis Externa Heera Luthra1 • Vishal Sharma2
•
Neerja Jindal3
Received: 21 August 2020 / Accepted: 14 September 2020 Association of Otolaryngologists of India 2020
Abstract Otitis externa is a common condition encountered in the ENT outdoors. For long, it was thought to be of fungal etiology but after World War II, bacterial pathogens were found to be most commonly involved. Pseudomonas has been described as the most common causative organism in the literature. This prospective study aimed to study the microbiological profile and antibiotic sensitivity of 100 patients of otitis externa. 100 diagnosed cases of otitis externa were included in the study after informed consent. Swabs were taken from the external acoustic canal maintaining asepsis. The swabs were analysed using microscopy, culture and sensitivity testing. The samples were cultured on blood agar, MacConkey agar and Sabourad’s dextrose agar with antibiotics. Antimicrobial susceptibility testing was done by Kirby–Bauer disc diffusion method. The most common bacteria identified was Pseudomonas aeruginosa (36.36%), followed by Staphylococcus aureus (15.45%), Escherichia coli (2.73%), Klebsiella (1.82%), and Proteus sp (1.82%). Aspergillus sp (19.09%) and Candida albicans (8.18%) were the fungal species identified. Pseudomonas showed excellent sensitivity to imipenem, piperacillin and ofloxacin, while Staphylococcus showed good sensitivity to vancomycin, ofloxacin and netilmycin. Topical fluoroquinolones can be used as empirical treatment in most cases of bacterial otitis externa. & Vishal Sharma [email protected] 1
Department of Otorhinolaryngology, Guru Gobind Singh Medical College and Hospital, Faridkot, Faridkot, India
2
Department of Otorhinolaryngology, Government Medical College, Patiala, Patiala, India
3
Department of Microbiology, Guru Gobind Singh Medical College and Hospital, Faridkot, Faridkot, India
In resistant cases, culture and antibiotic sensitivity should be done to manage the infection. Keywords Otitis externa Pseudomonas Antibiotic sensitivity Ofloxacin
Introduction Since its description by Mayer in 1844 till World War II, otitis externa was considered to be of fungal origin. Due to high percentage of cases during World War II, its etiology was re-examined and established to be bacterial in nature. Otitis externa is a common condition encountered in ENT outdoors. In warm and humid environment, the incidence of this disease increases further more. It is defined as the inflammation of the external ear. It is also commonly known as ‘‘Swimmer’s Ear’’ or ‘‘Tropical Ear’’. It can take the form of an acute or a chronic condition with multiple etiologies including infections, trauma and allergic reactions [1]. The most common bacteria isolated include Pseudomonas species (50–65%), other gram-negative organisms (25–35%), Staph aureus (15–30%) and Streptococci (9–15%). The most common fungi isolated includes Aspergillus species (80–90%) f
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