microorganism

The disease is caused by a microorganism and several bacteria have been suspected of being responsible.

Staphylococcus pyogenes aureus—a microorganism producing yellow pus.

Staphylococcus pyogenes citreus—a microorganism producing lemon-colored pus.

Staphylococcus pyogenes albus—a microorganism producing white pus.

This disease is caused by a microorganism known as the spirochaeta pallida or treponema pallidum of Schaudinn and Hoffmann.

A microorganism which apparently has a specific relationship to Rocky Mountain spotted fever.