1Senior Resident, Microbiology, AIIMS, Rishikesh, Uttarakhand
2Associate Professor, Microbiology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka, India
*Corresponding Author: Suchitra Shenoy M., MBBS, MD, Associate Professor, Microbiology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Karnataka, India, 575001, e-mail: suchitra_93@yahoo.co.in, Contact Number: 9886216667
Online published on 27 March, 2020.
Community Acquired Pneumonia (CAP) is leading cause of morbidity and mortality in all age groups globally. 4 million cases of Community Acquired Pneumonia occur annually. Haemophilus influenzae is a causative organism of CAP. Empirical treatment with antibiotics like levofloxacin and azithromycin is recommended in these cases.
This study was conducted to evaluate the minimum inhibitory concentration of levofloxacin and azithromycin in H. influenzae isolates from respiratory specimens.
Minimum inhibitory concentrations of levofloxacin and azithromycin in 40 clinically significant H.influenzaeisolates were tested using E-test method after the approval of Institutional Ethics committee. The results were analyzed according to 2019 CLSI guidelines.
MIC50 for levofloxacin was 0.008 μg/ml, MIC90 1.5 μg/ml and the 3 resistant isolates had MIC ranging between 8 and 12 μg/ml. Azithromycin MIC50 was 0.047μg/ml, MIC90 6.4 μg/ml and 5 resistant isolates had MIC between 6 and 32μg/ml.
The rising MIC of levofloxacin and azithromycin in H.influenzaeemphasizes the need to monitor the antibiotic susceptibility pattern on a regular basis. It is also advisable to restrain the use of fluoroquinolones to make it available for use in the tuberculosis treatment and also to avoid any adverse effects.
Haemophilus, azithromycin, levofloxacin, minimum inhibitory concentration
