Just got back from Redi Care South, where a doctor finally listened to me.
They ran the quick test again, and it was negative, but since Anne's labwork came back positive and it's very likely that I have what she has, he wrote up a prescription for Zithromax.
So, I should be non-contagious before Tania's cousin arrives from the UK and should start feeling better soon.
(non-sarcastic) Yay!