Merck Manual

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Clostridium, rabbit fecal smear
<i >Clostridium</i>, rabbit fecal smear
Clostridium, rabbit fecal smear

Note the clostridial cell in the unstained, fresh fecal smear (white arrow). The bacteria contains a spore that gives it a typical safety pin appearance.

Courtesy of Dr. Joerg Mayer.