Has anyone considered that the zombie infection could be caused by microscopic parasites? Tonya had access to a microscope so she should have been able to spot this UNLESS everyone is infected and it takes a bite to activate the parasites.
Maybe Tonya is infected with the parasite so she is deliberately lying about it for fear of being killed.
I think my theory is flawed but I want to flesh it out a little anyways
There are some cool possibilities
Brain eating amebas, when someone tells you its dangerous to use a Neti-pot to clean your sinus it is because of the rare possibility to get this.
http://www.cdc.gov/parasites/naegleria/
Weird strain of Malaria, it looks like malaria is detected using a technique called "blood film" that Tonya might not have tried
http://en.wikipedia.org/wiki/Malaria
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