Refers specifically to the human body louse (Pediculus humanus humanus), a parasitic insect that lives on clothing and feeds on human blood.
Body lice tend to appear in unsanitary environments.
Body lice were found on his clothes.
Katakana spelling is standard; the word is usually written in kana.
Kanji form is rare and may not be widely recognized.
Compound of 衣 (ころも, 'clothing') and 虱 (しらみ, 'louse'). The reading じらみ is a voiced variant (rendaku) of しらみ.