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Occurrence of blaTEM and blaROB in Haemophilus species Causing Respiratory Tract Infections

[ Vol. 20 , Issue. 3 ]


Prerna Khurana and Suchitra Shenoy*   Pages 385 - 388 ( 4 )


Background: Emergence of resistance to some antibiotics in Haemophilus influenzae, a respiratory pathogen is a cause of concern. The aim is to study the antibiotic susceptibility pattern of Haemophilus isolates from respiratory infections with reference to beta-lactam resistance.

Methods: This is a laboratory based prospective study done in the department of microbiology in a tertiary care center after institutional ethics committee clearance. Haemophilus influenzae isolates from respiratory tract specimens over a period of one year were subjected to antibiotic susceptibility tests. Beta-lactamase production was detected by nitrocefin disc. hpd gene, blaTEM and blaROB genes were detected by PCR. The data was analysed using SPSS 11.5 version.

Results: Of the 162 isolates, 89.5% were from sputum specimens. Ampicillin resistance was seen in 5 (3.09%) isolates. The ampicillin resistant strains were positive for beta-lactamase enzyme and blaTEM gene. BLNAR and isolates with blaROB gene were not found.

Conclusion: In case of Haemophilus influenzae respiratory tract infection empirical treatment with amoxicillin clavulanate or third generation cephalosporin may be the drugs of choice in our geographic area.


Haemophilus, ROB, TEM, respiratory pathogen, sputum specimens, Haemophilus influenzae.


Senior Resident, Clinical Microbiology and Infectious Diseases, CNBC, Delhi, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka 576104

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