Journal of Laboratory Physicians
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Year : 2019  |  Volume : 11  |  Issue : 1  |  Page : 45-50

Typing of Neisseria gonorrhoeae isolates by phenotypic and genotypic techniques in New Delhi, India

1 Department of Microbiology, All India Institute of Medical Sciences, New Delhi, India
2 Department of Dermatology, STDs and Leprosy, PGIMER and Dr. Ram Manohar Lohia Hospital, New Delhi, India
3 Department of Dermatology and Venereology, All India Institute of Medical Sciences, New Delhi, India

Correspondence Address:
Prof. Seema Sood
Department of Microbiology, All India Institute of Medical Sciences, New Delhi - 110 029
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/JLP.JLP_107_18

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BACKGROUND: The objective of this study is to investigate gonococcal isolates using phenotypic and genotypic methods. METHODOLOGY: Sixty gonococcal isolates obtained were examined. Strains were divided into 9 resistant phenotypes: Chromosomally mediated penicillin-resistant Neisseria gonorrhoeae (CMRNGP), penicillinase-producing NG (PPNG), chromosomally mediated tetracycline-resistant NG (CMRNGT), TRNG, PPNG and TRNG, CMRNGPT, quinolone resistant NG (QRNG), Azithro R, and decreased susceptibility (DS) to ceftriaxone. These isolates were also subjected to auxotyping and NG-multi-antigen sequence typing (MAST). RESULTS: Of 60 isolates, 32 (53.33%) PPNG and only one was CMRNGP; 16 (26.66%) were CMRNGT, while 18 (30%) were TRNG. Both PPNG and TRNG found in 13 (21.66%) and none were CMRNGPT. QRNG was seen in 93.33%, 5% Azithromycin R, and 6.66% were DS to ceftriaxone. Based on auxotyping, 24 (40%) nonrequiring, 16 (26.66%) were proline requiring, 13 (21.66%) arginine requiring while 7 (11.66%) belonged to others. The most common ST was 6058 (32.5%). The discriminatory indices of antibiogram, auxotyping and NG-MAST were 0.77, 0.72, and 0.95, respectively. CONCLUSIONS: NG-MAST is the method of choice for epidemiological studies.

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