why is contaminated milk being dumped into the wastewater system? and what is contaminated milk even have to do with H5N1? it's avain flu and last I checked birds don't have tiddies
"H5N1" is a crude description of a wide variety of strains, some more amenable to avian hosts, some not.
As for why milk is being dumped into the wastewater system? Because that's where it goes.