Bird Flu: Tom
Stehn Speaks
(March 20, 2006)
Wild birds are subject to all kinds of potential diseases.
We know avian tuberculosis and fowl cholera have killed whooping cranes.
West Nile Virus is a new introduced disease that has killed numerous
birds, but fortunately whooping crane adults seem to be only mildly
impacted.
I am not overly concerned about bird flu. Bird flu has presumably been
around for years and years, but in the dense populations that domestic
poultry are kept in, diseases can spread rapidly and can become a real
problem. Since the type of bird flu that health experts are concerned
about (H5N1) has not yet been documented in North
America [as of March, 2006], I am not particularly concerned about
how it might impact wild whooping cranes.
However, what I am concerned about is what might happen to the captive
flocks of whooping cranes if H5N1 is found in the captive whooping
cranes, or is found in flocks of domestic chickens near the captive
whooping crane flocks. Current U.S. Department of Agriculture policy
calls for eradication of all domestic birds within 4 kilometers of
an outbreak. I wonder what would happen if an outbreak in domestic
poultry occurs near a captive whooping crane flock or near a zoo? Hopefully
some kind of quarantine could be imposed so that rare birds could be
saved.
Tom Stehn, Whooping Crane Coordinator
U.S. Fish and Wildlife Service
Aransas NWR
P.O. Box 100
Austwell, TX 77950