Hanta virus status

[d hayman]

and am interested in learning of the current status and 
epidemiology of the virus.  There have 
been no re-occurences.  Is there any evidence that the virus is 
restricted to warmer areas?  

Our area (northern Montana) has a significant amount of grain 
milling, and it was my feeling that the agent arrived from 
infected mice via rail and the grain shipments. Subsequent CDC 
investigation relating to the fatalities was inconclusive, at 
least that which was reported to the public. One of the 
fatalities was an employee of a mill.  The investigation did 
establish the virus occurring in local mouse populations, though 
I do not recall the tests used to confirm isolation.  

Please excuse the rather cryptic message.  

Thankyou for sources and/or information.