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ICMR-VRDL Study: All Four Dengue Serotypes Co-Circulate in 8 States, 7% Patients Have Concurrent Infections

Target:UPSC GS-IIIMPSCSSC GATeachingPrelims HighMains MediumStatic GK Link
28 Jul 2026
~2 min
Source: The Hindu
Key Data:6,889 samples45 labs25 States/UTsDENV-2 predominant (over 50%)7% concurrent infection8 States/UTs with all 4 serotypes
Bodies:ICMRVRDL network
Practice MCQs from today's news ▸
What This Article Covers

1.ICMR-VRDL network's two-year study (2023-2025) analyzed 6,889 samples from 45 labs across 25 States/UTs.

2.DENV-2 remains the predominant serotype (over 50% of infections), but all four serotypes co-circulate in 8 States/UTs.

3.Concurrent infections (7% of patients) linked to more severe outcomes: low platelet count, bleeding, severe joint pain.

The Big Picture
Prelims · HighMains · Medium

A two-year nationwide ICMR-VRDL study reveals that all four dengue serotypes (DENV-1 to 4) are now co-circulating across India, with nearly 7% of patients infected with multiple strains simultaneously. This hyper-endemicity raises the risk of severe disease and poses fresh challenges for future dengue vaccination programs, as vaccine effectiveness varies by serotype.

Exam Lens

Quick Exam Facts From News

Study Period2023–2025
Samples Analyzed6,889
Labs Involved45 (VRDL network)
States/UTs Covered25
Predominant SerotypeDENV-2 (over 50%)
Concurrent Infection Rate~7% of patients
States with all 4 serotypes8 States/UTs
States with 3 serotypes15 States/UTs

1-Minute Revision

  • ›Study Period: 2023–2025
  • ›Samples Analyzed: 6,889
  • ›Target this Data: Study period 2023-2025, 6,889 samples, 45 labs, 25 States/UTs, 7% concurrent infection rate.
  • ›Target this Nodal Body: ICMR (Indian Council of Medical Research) and its VRDL network.
  • ›Target this Concept: Dengue serotypes (DENV-1 to 4) and the link between secondary/concurrent infection and severe disease.

Mastered this topic? Test your knowledge with a full MCQ quiz.

Practice exam-style questions, track your score, and strengthen your recall.

Q1Static LinkageEasy

Which organization conducted the two-year nationwide surveillance study on dengue serotypes mentioned in the news?

Q2Statement-basedHard

Consider the following statements regarding the ICMR-VRDL study on dengue:

1. The study found that DENV-2 was the predominant serotype, accounting for over half of all infections.

2. All four dengue serotypes were found co-circulating in 15 States and Union Territories.

3. Patients with concurrent infections with multiple serotypes showed a higher likelihood of severe manifestations like low platelet counts and bleeding.

Which of the statements given above is/are correct?

Q3Data-centricMedium

According to the ICMR-VRDL study, what percentage of dengue patients were found to be infected with two or more serotypes concurrently?

Q4Application/ImpactMedium

What is the primary implication of dengue hyperendemicity for India's public health strategy, as highlighted in the news?

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