Guys, it's flocculated yeast that, probably due to static electricity has stuck on the inside of the sides of the bottle. It's the same thing that happens in the hundreds of panic threads about it clinging to the side of carboys, like this;
A little info on infections seems necessary kiddies, a visible infection can ONLY form on the SURFACE of a beer!!!! Pelicules, and films and even mold, can only happen where there is oxygen present, or where the surface comes in contact with oxygen. They form SKINS..... Something inside a bottles (which is pretty much a vacumm) or below the surface of the beer in a fermenter is in an Anerobic environment, infections can't grow there.
If you see anything below the surface it's not an infection it's just a floatie and 99.99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999% of the time, the floaty in a bottle of beer is going to be yeast and perfectly normal.
Quit jumping at everything that might look strange in fermentation, it all looks strange, and smells strange. Fermentation is ugly and stinky....when it's perfectly normal.
