HYGIENIC GROOMING. “The bodies of fungal-killed aphids were quickly removed from ant-tended aphid colonies. Ant workers were also able to detect infective conidia on the cuticle of living aphids and responded by either removing or grooming these aphids.”
http://rsbl.royalsocietypublishing.org/content/early/2009/11/16/rsbl.2009.0743.short