Lice persist, what to do? - briefly
Use a proven lice treatment (e.g., 1% permethrin shampoo) and repeat it after 7–10 days, then comb out any remaining nits with a fine-tooth nit comb. Wash all bedding, clothing, and personal items in hot water and vacuum the living area to eliminate stray lice and eggs.
Lice persist, what to do? - in detail
Head lice can survive after the first round of treatment, indicating that the infestation was not fully eradicated or that reinfestation has occurred.
Common causes include incomplete application of medication, use of products to which lice have developed resistance, failure to remove all viable eggs, and contact with untreated sources such as personal items or close contacts.
To address a persistent problem, follow these steps:
- Verify the presence of live lice and viable nits using a fine-toothed comb on dry hair under bright light.
- Apply an approved pediculicide according to the manufacturer’s instructions, ensuring the product contacts the scalp and hair for the required duration.
- After the recommended waiting period, comb the hair thoroughly with a nit comb to extract remaining eggs.
- Repeat the entire treatment cycle after 7‑9 days to eliminate newly hatched lice that survived the first application.
If over‑the‑counter options prove ineffective, consult a healthcare professional for prescription‑strength agents such as spinosad, ivermectin, or malathion.
Environmental measures are essential:
- Wash clothing, bedding, and towels used in the previous 48 hours in hot water (≥130 °F) and dry on high heat.
- Seal non‑washable items in a sealed plastic bag for two weeks.
- Vacuum carpets, upholstered furniture, and vehicle seats to remove stray nits.
Preventive practices reduce the risk of recurrence:
- Prohibit sharing of hats, hair accessories, headphones, or bedding.
- Conduct weekly head inspections, especially after group activities.
- Educate caregivers and school personnel about early detection and proper treatment protocols.
Consistent application of these measures typically resolves the infestation within two to three treatment cycles.