NIH SciBites: Using Itch to Fight Ticks

Why It Matters

An itch‑based intervention would offer a simple, scalable method to prevent tick‑borne infections, potentially lowering public‑health burdens and healthcare expenditures.

Key Takeaways

• Itch response can prompt rapid tick removal, reducing disease risk
• Prior tick exposure trains immune system to trigger itch via cytokines
• Animal studies show scratching eliminates ticks before pathogen transmission
• Researchers aim to develop human treatments that induce itch after bites
• Enhancing itch may become preventive strategy against Lyme and other tick-borne illnesses

Summary

The NIH’s SciBites team, led by post‑bac researcher Ronja, unveiled a discovery that harnessing the body’s itch response could accelerate tick removal and curb transmission of tick‑borne illnesses such as Lyme disease.

Ticks often go unnoticed for the 24‑ to 48‑hour window needed for pathogens like Borrelia to migrate into the host. The researchers found that animals previously exposed to tick bites develop a cytokine‑driven immune response that simultaneously summons immune cells and activates itch‑sensing neurons, prompting the host to scratch the attached tick before infection can occur.

In controlled animal experiments, previously bitten subjects consistently scratched off new ticks within minutes, effectively blocking disease transmission. Ronja explained, “When the animals feel that itch, they scratch off the ticks, stopping disease transmission in its tracks.”

If a comparable itch‑inducing therapy can be safely translated to humans, it could become a low‑cost, behavior‑based preventive tool, reducing Lyme disease incidence and the associated medical costs.

Original Description

Blood-sucking bugs like ticks and mosquitos spread a variety of illnesses. Ronja Frigard, a postbaccalaureate research fellow at the National Institutes of Health (NIH), is trying to make tick bites extra itchy so we can detect and remove them more quickly. This kind of built-in bug protection would give ticks less time to transmit diseases like Lyme disease to the people they latch onto.

Click here to learn more about the research being done in Ronja’s lab: https://irp.nih.gov/pi/jesus-valenzuela