Journal of Vector Borne Diseases (Jan 2024)

Circulating serotypes and genotypes of dengue virus in North India: An observational study

  • Om Prakash,
  • Anil Kumar Verma,
  • Asutosh Paliwal,
  • Faisal Abbas,
  • Ashish Kumar Srivastava,
  • Vivek Kumar Mishra,
  • Shruti Radera,
  • Amita Jain

DOI
https://doi.org/10.4103/0972-9062.392258
Journal volume & issue
Vol. 61, no. 1
pp. 117 – 122

Abstract

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Background & objectives: This study reports observation on circulating serotypes and genotypes of Dengue Virus in North India. Methods: Serum samples were obtained from suspected cases of dengue referred to the virus diagnostic laboratory during 2014 to 2022. All samples were tested for anti-dengue virus IgM antibodies and NS1Ag by ELISA. NS1Ag positive samples were processed for serotyping and genotyping. Results: Total 41,476 dengue suspected cases were referred to the laboratory of which 12,292 (29.6%) tested positive. Anti-Dengue Virus IgM antibodies, NS1Ag, both IgM and NS1Ag, were positive in 7007 (57.4%); 3200 (26.0%) and 2085 (16.0%) cases respectively. Total 762 strains were serotyped during 9-year period. DENV-1, DENV-2, DENV-3 and DENV-4 serotypes were found in 79 (10.37%), 506 (66.40%), 151 (19.82%) and 26 (3.41%) cases respectively. DENV-1, DENV-2 and DENV-3 were in circulation throughout. Total 105 strains were genotyped. Genotype IV of DENV-1 serotype was circulating till 2014 which was later replaced by genotype V. A distinct seasonality with increase in number of cases in post-monsoon period was seen. Interpretation & conclusion: DENV-1, DENV-2 and DENV-3 were found to be in circulation in North India. Predominant serotype/genotype changed at times, but not at regular intervals.

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