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Very interesting! Like me, you've clearly been watching closely what insects get up to since a young age... I like to know what species I'm looking at, but have always been most intrigued by what they are doing, and so much of what insects do gets overlooked even by experts with less interest in behaviour. As for your wasp, I doubt it would have become infected from the little I know of E. muscae's host range: this is an excerpt from the wikipedia entry on it: As well as the housefly, Musca domestica, infection has been observed in adult flies in the families Calliphoridae, Culicidae Drosophilidae, Muscidae, Sarcophagidae, Scatophagidae, Syrphidae and Tachinidae.[2] That may not be the most definitive source, but the name of the fungus is maybe a clue that it has a limited host range. Some Hymenoptera (ants for sure) are also very resistant to fungal attack, maybe vital due to often subterranean habits. The wasp may have helped spread the spores, though... All part of the "Fungus Masterplan" - as shaped by what has worked over the aeons - maybe..