I had some issues with foul brood (EFB) earlier this year and now I am smelling some questionable odors from some hives in another yard. I examined the hive and only found a very small number of perforated cappings with dead larva. However that characteristic odor was present. My question ( I tried to search this but found no definitive answer) pertains to whether I am just smelling dead brood or EFB? Does decaying brood put off an odor similar to EFB or should I be concerned about the possibility of a EFB infection? I'm unsure what to do since the hive appears healthy and the dead brood is minimal. Brood pattern is spotty but I think that is just where the laying cycle is currently. Population appears fine. Is there a trick to differentiate between natural cause dead brood (nurse bee shortage, faulty eggs, etc) and EFB?