Vegetables may be contaminated by soil or accidental hosts. Cooking for 20 minutes to an internal temperature of 150 F will kill tissue cysts and freezing to -200 F for several days will reduce the number of cysts. Rubber gloves and regular hand washing will minimize the chance of infection. The sporulated oocysts in the environment and tissue cysts are infective immediately and protective measures are much more important here than when handling and caring for cats. Infection from direct contact with cats shedding oocysts is not very likely.
Cats only shed oocysts for a few days to weeks in their lives after primary infection.
Cat feces are generally firm and cats do not soil their coats or they groom away any feces quickly. As stated above, it takes several days for the oocyst to sporulate and become infective, thus fresh feces are not contagious. Wearing rubber gloves and washing hands after cleaning litter boxes will prevent infection. Clothes or coveralls worn when cleaning cat pans and cages should be washed after each use. Cat feces and litter dust are not likely to be a source of human infection in the context of a kennel situation if the litter is changed daily and the pans are disinfected by steam or hot water.