[knobby appearance of RBC] Watch out for malaria! Ring-form trophozoites of P. falciparum in a thin blood smear.
Pubic lice are caused by the parasitic insect Phthirus pubis. Phthirus pubis is 'crab'-shaped, grey-brown in colour, and about 2 mm in length. The female lays eggs (smaller than a pinhead) on the hair shaft, near to the body. The eggs hatch after about six to ten days. The empty nit eggshells are tightly attached to the hair. The female louse lives for one to three months. This chapter is set out as follows: