whats up with lice lately, seriously there have been several posts about lice recently its making my head itch

this past yr was our first brush with "it" at one of my DS' preschool. Luckily we didnt get it but it was horrible as it was a resistant type of lice (to things like nix or rid) and the families that got it had a horrible time getting rid of it.
Because I was super paranoid I did everything possible to make sure we didnt catch it especially because we co sleep and really if 1 in my house gets it we ALL will have it. I ended up following my peds suggestions, not sure if any one thing helped or heck if anything helped but we didnt get it and literally more than 2/3 of the preschool got it

I bought this product
http://www.liceguard.com/ and used it daily after school and on everyone for a few weeks. now I only use it on my child who goes to school. I also keep the fine tooth comb and when I shampoo their hair I do a quick combing at their nape of the head and around their ears as prevention (thats where they are supposed to like to attach nits)
We put TTO in our shampoo as they are supposed to not like the smell. I also made sure that my kid had "product" (hairspray,mouuse,gel)in his hair because its supposed to be harder for them to catch on to the hair in the first place.
during the initial outbreak I washed our sheets/linens often on the hottest settings basically to make me feel better.
The thing is is ANYONE can get lice, I always thought it was a "dirty" thing but after being reassured by my ped and seeing IRL people who got it I now know thats not the case so yes its possible for an adult to pass to a child.