Deadly to immunocompromised people. Basically everything could be deadly to them. Cats also rarely attack human proactively. So not really a big concern.
Hypochlorous acid (HOCl) is highly effective at killing Sporothrix fungi, including Sporothrix brasiliensis
HOCl is the best non-toxic broad spectrum human compatible antimicrobial. I have been using it in many household applications since COVID started.
It can be prepared by electrolysis of acidified (e.g. vinegar, but ideally pH 5.5, and inorganic acids make it last way longer at that pH, but they are more dangerous to handle) salt water (high margin of safety) or alternatively prepared by mixing highly diluted bleach with an diluted acid (low margin of safety) to target 20-2000 ppm depending on your delivery method (e.g. one tablespoon of bleach and vinegar into a gallon of water). If you are worried about the safety of this approach, note that far, far less chlorine gas is emitted when made this way than by ordinary bathroom cleaning with a bleach-based bathroom cleaner.
The smell of HOCl is unique and completely different from chlorine gas. The small amount of chlorine gas emitted likes to sit on top of the surface of the water, but if this layer is blown away, the distinct smell of HOCl becomes apparent immediately. It smells like minty bubblegum or something more familiar: a swimming pool.
The good news is when making HOCl for disinfection purposes 20-2000 ppm, only very small quantities of chlorine gas are evolved. They can be reduced further by shaking the closed container used to make it, further dissolving the gas into solution to make more HOCl.
I run this solution in my humidifier at low concentrations to prevent microorganisms from growing in it. I also use the electrolysis method to accurately make very low concentrations for nasal rinses. Typically, 15-30 seconds from a $10 USB electrolyzer in salt water.
"AI Overview" blithely tells me HOCL can be easily made from the electrolysis of salt water.
Looking even a little deeper (Wikipedia) confirms that chlorine chemistry, especially when combined with electrolysis, is very complex, and it's hard to know if you're making the right thing. FWIW every sensible electrolysis-based DIY project has dire warnings about electrolysing solutions of common salt.
Still, it is more concerning for cats than humans.