if it kills birds but spreads to humans than it has two hosts it can hop between. Most outbreaks that kill their hosts are maladapted. The black plague didn't k

if it kills birds but spreads to humans than it has two hosts it can hop between. Most outbreaks that kill their hosts are maladapted. The black plague didn't kill rats, covid didn't kill bats, HIV didn't kill chimps, etc. If you are a virus and you're killing your host at a rapid rate then you are killing yourself. The only time it can make sense evolutionary to kill your host is when you have multiple host options. This could devastate the poultry industry for far longer than we expected