Well, the test results came in for an ear infection that has screwed my right ear up for a month.
The lab cultivated https://en.wikipedia.org/wiki/Pseudomonas_aeruginosa from a swab of my ear.
This is one nasty mofo. Caught from the local swimming baths I have almost no doubt.
This makes your ear weep infection like there is no tomorrow. You have to walk around with bits of tissue in your ear, which you have to replace frequently. You lose hearing to about 40% of normal in the infected ear.
It doesn't want to respond to some antibiotics. Ended up using a powerful betamethasone and fusidic acid based cream, plus some ear drops containing neomycin plus betamethasone for deeper into the ear canal.
This can have you in a mess for months - literally. The only way to conquer it is to declare nuclear war on it. Not recommended. I've never had anything like it. The skin around your ear hole and ear lobe turn into a scaly weeping mess.
I am now cured. I think. Maybe. It likes to come back. So still a bit unsure.
So if you go swimming, think twice about not using ear plugs, particularly in indoor pools.