Manchester - you are right on. Here is an excerpt from an article by Brad Fresenburg at the University of Missouri(see Link below:
"The hidden danger on an artificial field is the threat of bacterial infections. Disinfectant should be sprayed as needed if there's a known infection risk, but Fresenburg said he doesn't know what procedures are necessary to prevent bacterial contamination in the first place.
"Natural grass has a microbial system. It's self-cleaning. These synthetic fields don't have that," Fresenburg said. "There's warmth. There's moisture. Bacteria can thrive in there. There's sweat, spit and blood."
Players need to immediately report any "turf-burns," abrasions so named for their similarity to rug burns. Turf burns are common on certain types of synthetic turf. They must be immediately washed with soap and water to prevent infection.
Often young athletes are inclined to ignore seemingly minor injuries. "We have done a good job of educating our students on turf burns," Sharp said. "We've had to educate our kids to let us clean and treat those."
http://www.plantmanagementnetwork.org/pub/ats/news/2005/synthetic/