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I live in the same area of Texas. If you still have any of those dead birds around or find new ones I would call the Denton County Extension service.
They will likely want one of the birds, if not all to test them. West Nile Virus is most likely to be of concern in the late summer and fall, but no need to put yourself at risk. With the warm weather we been having it's always a possiblity.
The extension service is a very helpful source for you. Take advantage of their knowledge and their help for this one.
I have listed the phone numbers and vital information for you below. I found it on the DentonCounty.com website.
Working Hour :
Monday - Friday8:00 a.m. - 5:00 p.m.[email protected]
Good Luck and I hope you get an answer from them soon.