A tan-coloured, thick, turbid, foul-smelling, 3 L peritoneal fluid drained on her first hospital day. The fluid has low glucose of <1.1 mmol/L, white blood cells (WBC) of 11 600×106/L, 94% distorted cells and bacteria 4+/hpf. Aerobic culture revealed Escherichia coli, ESBL+. Acid-fast bacilli (AFB) smear was negative, but TB culture yielded a pan-sensitive Mycobacterium tuberculosis. TB, tuberculosis.