If it's any comfort, I did the same thing the first week of this month, and I'm still fine.
I started at Tuolumne, went down to Tenaya, then to Clouds Rest, then Half Dome, then past Nevada and Vernal Falls down to the valley. Is that the same route you took?
Anyway, I normally only filter when I'm in the Sierras, and my filter suddenly made a weird noise, and then squirted the water freely, without filtering anything out. I could tell because I squirted some in my hand, and there was dirt floating around. Oh well. I was still 7 miles from the valley, and so I figured it was either risk giardia or die of thirst immediately. So I drank freely, and nothing came of it.
By the way, great job on your hike. What did you think of Clouds Rest? How about those cables on Half Dome?
z
