American foulbrood is a bacterial disease afflicting honey bee (Apis mellifera) colonies. The Paenibacillus larvae bacterium germinates in the gut of a honey bee larva; dead larvae often decompose into a brown, gooey substance. New research suggests certain analogs to a molecule called indole may be useful in blocking the bacteria’s germination. (Photo credit: Wikimedia Commons/Tanarus, CC BY-SA 3.0)