PHIL_4077_Phthirus pubis Published March 20, 2011 at 700 × 519 in STD Awareness: Three Sexually Transmitted Bacteria That Will Shock and Amaze You Phthirus pubis, the louse that causes scabies. Image from the Public Health Image Library. Phthirus pubis, the louse that causes scabies. Image from the Public Health Image Library.