This disease is caused by infection of the brain with a one-celled parasite called Toxoplasma gondii . The organism clings to the dust that arises when the cat litter is dumped, and when this dust is breathed in, a Toxoplasmosis infection can result if the person is HIV infected. It may seem bizarre that you may daily run the risk of a potentially fatal brain infection from a common houshold pet, but if you are unaware of the risk of infection, you can't do anything to protect themself. This a good example of how information can save lives, because the truth is that even this frightening infection can be successfully prevented with adequate information. Ideally you should have the litter box changed by someone else, someone who is not HIV infected, but we realize that this may not always be possible.
Eye protection is probably also wise.
Dump the box out while holding it inside a large plastic garbage bag, being careful to hold the mouth of the bag shut with your other hand, so no dust escapes. Pull out the empty cat box, tie the bag shut, and put it outside immediately. Then wash the cat box with chlorine bleach, dry, and refill. You should also wash your hands anytime you touch or groom the cat. And new introductions will also bring in an occasional disease agent.