Now Reading: Delhi study finds early resistance sign in dengue mosquitoes
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Delhi study finds early resistance sign in dengue mosquitoes
A University of Delhi study has found that a laboratory strain of Aedes aegypti, the mosquito that spreads dengue, showed reduced susceptibility to the insecticide α-cypermethrin. At the diagnostic dose, 97.91% of…
A University of Delhi study has found that a laboratory strain of Aedes aegypti, the mosquito that spreads dengue, showed reduced susceptibility to the insecticide α-cypermethrin. At the diagnostic dose, 97.91% of adult females died, just below the 98% threshold for full susceptibility. The researchers called it an early sign of possible resistance developing.
The study, published in Frontiers in Tropical Diseases, detected a sharp 21.41-fold increase in β-esterase activity, an enzyme that may break down the insecticide. CYP450 activity also doubled, suggesting multiple protective mechanisms. The colony had not been exposed to insecticide before, making the response notable.
The authors stressed the findings do not mean α-cypermethrin is failing in the field. They recommended rotating insecticides, using enzyme inhibitors, and removing breeding sites to preserve current tools. Delaying resistance, they said, depends on tracking enzyme markers and field mortality now.
Indian Opinion Analysis
The Times of India report frames the University of Delhi study as an early scientific warning, not a current crisis. It emphasises the 97.91% kill rate and calls the resistance sign 'small but serious'. The story carefully hedges: the enzyme response is 'intriguing' but requires 'cautious reading'. There is no political or official angle. This is straight science reporting with a public-health lens. The coverage is uniformly neutral and technical. No source offers a critical or pro-government slant. The measured takeaway is that Indian public health agencies have an opportunity to rotate insecticides now, before field resistance becomes measurable. The key number to watch from the study is the 21.41-fold rise in β-esterase activity, which the story flags as the lead enzyme to monitor in the field.
Coverage: 1 source, 1 neutral
Source: timesofindia.indiatimes.com (neutral report)
This story was synthesised by AI from the source linked above.
