Armidale Infection From Narrabri??

On Sunday Armidale locals were informed of a confirmed case of horse flu, another south of Uralla near Kentucky was also confirmed. The DPI is claiming these infections stem from Narrabri. Now unless I am mistaken the Narrabri Campdraft was on the weekend of the 25th & 26th of August. Sunday was the 23rd of September! We are told the incubation period is between 1 and 9 days (that is the longest I have heard, most are saying 1 to 5.) So how is it that we have new cases almost a month later?? The lack of information is a disgrace. God help us if it's foot and mouth next.
Kristy
Walcha