Giardia is horrible, but can be treated in humans with a five day course of Metronidazole (and no alcohol).
An ex caught it from a flatmate, got diagnosed because the (Polish, according to the doctor) lab tech recognised the symptoms from the description and, despite it not being requested, as nobody thought of it as a possibility, tested for Giardia. I wasn't impressed, but saw my GP (also Polish), who wrote out a prescription and I never experienced any symptoms, despite being the person who cleaned the bog and lived with a person with it for years, with them doing a lot of cooking.
I wouldn't be considered for a rescue dog or cat at all. No point even asking anymore, as the sort of telephone conversations I experienced were - interesting - I had to be simultaneously
Single
Married
Single
Widowed
Young
Old
Rich
Working
Not Working
With other animals they could inspect
No other animals
Living near a park
Having a huge garden
Prepared to keep them locked in at all times
Prepared to let them roam free
Able to stump up three hundred pound cash for two sight unseen animals
Capable of looking after kittens
Wouldn't dream of depriving a kitten of its mother for five months (that was the most hysterical one - apparently, saying I had experience of handrearing from 5 weeks old on three occasions and was prepared to do it again meant I actually just wanted a cute baby to take away from its mother and was a evil bitch)
Prepared to have a single cat
Only prepared to take two or more
Had to provide personal references from people who had known me to have a pet before
It appeared that to be deemed fit to take on two moggies or an untested dog of appearance approaching that of what is legally termed 'Pit Bull Type' (as most abandoned ones are) required me to be a wealthy widow, not working but aged under 35, able to run marathons, living in a huge house with paddock surrounded by twelve foot fencing and, most importantly, able to come up with at least three hundred pounds cash for animals I had never even met.
Or have a notable online presence, as that could help get more people interested and as such, all the previous requirements were no longer essentials...
I suppose if you have the money for a breeder but don't want to do it, can't get through the ridiculous, constantly changing goalposts of the workers, want something other than a bull type or want what could be interpreted as pedigree cat breeds over here and are easily manipulated by the stories of how those evil foreigners don't look after animals you pay for some terrified animal to be shipped across Europe.
Me, I ended up with freebie British TwatCats. Because I'm a mug. One's got Cerebellar Hypoplasia. A large charity had said they'd take the healthy ones and the mother a friend had been feeding straight away, but they'd put this one down as they'd never get anybody to pay the adoption fee and vet bills for one that wasn't right. I brought him home at 7 weeks in my handbag on the Tube as a result. The only time he's needed vet treatment was to have his knackers chopped off and when he came off worst in an argument with a mouse (a tenner for some antibiotics). He's been cheaper than any animal I've ever had before.
He's still a Twat, though. But he's my TwatCat and I love him