The airborne part is true, sorta. The thing is that most cat litter tends to be dusty, so you can inhale the dust/fecal matter while scooping the litter box. So it's not airborne in the way that just going into the same room as the litter box and smelling it can cause you to get it, but inhaling some dust that gets into the air while cleaning the box can cause infection.
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As a tech I spend way to much of my time working with cat poop, lol. That said I'll handle it (with gloves) for things like a fecal exam or when doing an enema but I won't change a litter box. With a fecal exam or enema I'm dealing with JUST the fecal matter, no real risk of it being airborne and I just wear gloves and wash my hands after. With a litter box it can become airborne in the dust and that isn't as easy to protect against. If I absolutely needed to change the box I would wear a mask when doing so, but since I have other techs at work and the kids and DH at home I just avoid it.
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As to how it is acquired a cat gets it from eating live prey OR other cats, only cats produce the "eggs" of toxoplasmosis but other animals can be carriers and pass it on if eaten. So I'll use my guys as an example. Two out of my three cats were to young to have eaten actual prey before they were found and I adopted them. My third cat on the other hand was older and had definitely eaten wild prey before she was trapped. My third cat likely has toxo from the prey. This first two might or might not. It's possible that if their mother had an active infection or another cat in the colony they were in that they could have acquired it at that time or it could have been transferred from my third cat if they were around while she had an active infection. That said, it's VERY unlikely that a cat that has not had wild prey has toxo but it is possible. Cats only actually shed toxo while an active infection is going on and that's really only a few days out of their entire life, so getting it directly from a cat that you have owned for awhile and is only indoors would be really very rare.
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The bigger issue is that all of the above goes for other things beyond just a litter box. All the same precautions should go into any sort of gardening or soil work because it's fairly likely a stray/feral cat could have used that area for a bathroom and now the soil is infected. Infected soil and meat/veggies are actually more likely how most people acquire toxo.
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