Dear Les:
Thank you again.
I forgot about domestic ducks when making the post; even here, some H5N1 can be lethal, but also know of sometimes infecting without symptoms.
The comment on bad vaccines by Robert Webster was in a presentation/document, titled Research Issues in Animal Surveillance and Pandemic Planning.
I’d thought of temperature for autumn, in China (read of cooler rainy seasons in more tropical places leading to H5N1 outbreaks perhaps increasing); not re the movements for festivals etc.
Martin