roundworm

Question
I am fostering 2 kittens that are 4-5 weeks old. The shelter told me they where de-wormed once and will be de-wormed once again in 3 weeks when I will return them. The day after I picked them up, the male had a stool with roundworms in it. These cats are being kept strictly indoors with me. I have learned that roundworms may be contagious to humans. This is keeping me from enjoying fully these kitties, I am obsessively washing my hands especially because they are so small they do not clean their bottoms properly and I have found fecal residue around the house. They tend to use their the litter box but they tend to go everywhere,tables,couches,chairs, I am sure somehow fecal matter can be anywhere and my biggest fear is that in microscopic doses it eventually will end up inadvertently in my mouth somehow. I really love to foster but I am worried that the  fear of the risk of getting infected will at the end prevail and I will give up fostering homeless kittens.
Please let me know more about roundworms and the risks of getting infected. Also is there any special product that could kill any larvae? Would lysol do the job?
Also if I would consider re- fostering is there any good product to disinfect the whole area so that new kittens will not get infected?

Answer
As long as you are keeping their area clean, and washing your hands, there is an extremely small risk that you will become infected, or that future kittens will pick it up.  Though people can be infected, children are usually the one's who pick it up as they are much more likely to be putting infected material in their mouths (i.e. dirty fingers or dirt) and ingest the eggs.  If the kittens you have are not using their litter box correctly, then I would suggest confining them to one room so you can minimize the chance of them spreading it throughout the house.  Any disinfectant that you can buy such as Lysol or Pinesol should kill any eggs that might be on the floor or surfaces.  Foster parents are unfortunately few and far between, so I commend you for helping out and hope you will continue to do so in the future.

Amanda