How can lice be searched for? - briefly
A wet‑comb technique—applying a fine‑toothed lice comb to damp, conditioned hair and checking the comb after each stroke—exposes live insects and attached nits. Supplementary options include a handheld magnifier, a detection lamp, or commercial kits that use adhesive strips or electronic sensors.
How can lice be searched for? - in detail
Detecting head‑lice infestations requires systematic examination of the scalp, hair, and surrounding environment. Effective identification combines direct visual methods with specialized tools and, when necessary, laboratory analysis.
- Visual inspection: Part hair in small sections, examine each strand for live insects, nymphs, or viable eggs (nits) attached close to the scalp. Use a magnifying lens (10×–15×) to improve accuracy.
- Fine‑tooth combing: Run a metal lice comb through damp hair from the scalp outward, wiping the comb after each pass. Collect dislodged specimens on a white surface for easier recognition.
- Microscopic examination: Place collected samples on a slide, cover with a coverslip, and view under a light microscope (100–400×). Confirm species by observing characteristic body shape, antennae, and claw arrangement.
- Chemical detection: Apply a non‑toxic, water‑soluble dye (e.g., dimethyl sulfoxide‑based solution) to the scalp; the dye stains the exoskeleton of lice, making them visible under normal lighting.
- Environmental sampling: Inspect personal items (hats, scarves, pillowcases) using adhesive tape lifts or vacuum‑filter methods. Transfer any captured material to a microscope slide for identification.
Document findings with photographs or written notes, noting the location of live lice, nymphs, and nits. Record the number of specimens and any treatment measures applied. This comprehensive approach ensures reliable detection, facilitates timely intervention, and provides a record for follow‑up assessments.