Threadworm

NICE Clinical Knowledge Summaries - Threadworm

Consider treating all household contacts (unless contraindicated) as threadworms are highly transmissible.

Advise rigorous hygiene measures for 2 weeks if treated with mebendazole, or 6 weeks if using hygiene measures alone:

• • Wash hands thoroughly with soap and warm water after using the toilet, changing nappies, and before handling food.
  • Cut fingernails regularly, avoid biting nails and scratching around the anus.
  • Shower each morning, including the perianal area, to remove eggs from the skin.
  • Change bed linen and nightwear daily for several days after treatment.
    • Do not shake out items as this may distribute eggs around the room.
    • Washing/drying in a hot cycle will kill threadworm eggs.
  • Thoroughly dust and vacuum (including vacuuming mattresses) and clean the bathroom by 'damp-dusting' surfaces, washing the cloth frequently in hot water

If infection recurs this is usually due to re-infection not failure of anthelmintic therapy:

• • Consider other causes of symptoms and re-treat with mebendazole if the diagnosis is certain – ensure all household contacts are treated (unless contraindicated).
  • Reinforce the importance of strict hygiene measures as above.