How to infect a heron or egret?
Indeed intriguing re just how these herons/egrets have been infected.
If not scavenging bird corpses (with Grey Heron before, I've wondered re scavenging dead chickens tossed into creeks),
then perhaps from water - but why so few individuals, why not ducks (which we know can readily catch n spread wild bird flus - Anatidae evidently being chief reservoirs of these wild flus)?
From fish, with sufficient virus in stomachs?? (maybe after eating poultry manure, offal from infected poultry?)
