My daughter is doing her science fair project for 5th grade. She is trying to see how much bacteria there is growing on three types of flooring, wood tile and carpet. She determined that she needs to use Agar plates to count the bacteria. So I ordered her some plates and am trying to figure out the right way for her to apply samples to these things. We’ve read a few sites that try to explain but they aren’t totally clear. Does she take a dry cotton swab and wipe it on the three floor types and then smear that onto the agar? Does she wet the swab then take the sample and wipe it on the agar? It sounds like the isn’t supposed to break the skin of the agar but then several sites show zig zagging through the stuff.
Can someone tell me how to properly take the samples and get them onto the agar without hosing everything up?