Different antibiotics are used for various treatments so your low dose for cellulitis isn't what would be used if a sinus infection took hold. Infections aren't caused by viruses, they are bacterial, or are a bacterial side effect of a virus. What treats bronchitis probably isn't what will treat cellulitis.

I fought off sinus infection and bronchitis for a week or more after the recent head cold by using guaifenesin and the neti pot to keep the congestion from building up too much and causing an infection.

After the work to put the floating row cover over my plants I don't think it actually froze last night. It did the night before, enough to knock out really tender stuff, so what I covered were the larger plants (eggplant, pepper, tomato) that I want to harvest later this fall. The hit or miss effect of the almost-freeze two nights ago is kind of interesting, what got hit and what didn't.