Lots of purrs from Sweden.
Hugfo Katt and Elisabet

Fungal lung infections are also fairly common in humans.  Several
years ago, a doctor noticed a shadow in my lungs on a chest X-ray.
He called in a lung specialist.  The lung specialist asked about my
medical history, in particular whether I had ever smoked (I haven't),
and decided to watch and see, rather than do an immediate biopsy.
One year, and a couple more lung X-rays, later, the shadow hadn't
changed any, so he concluded that it was a calcium deposit left
behind by an old fungal infection.  As of several years later, the
spot still hasn't changed size, so the diagnosis seems to be correct.

I don't remember the name of the disease, but it was one he said was
caught from breathing dust from bird droppings, and that most people
caught such an infection at some point in their lives.  The symptoms
are flu-like, so it is often misdiagnosed by the patient.  It
generally isn't life-threatening, unless the patient has already been
severely weakened by some other type of infection.

Yup, that's the one. Cryptococcus. Notice the name of the yeast, crypto
means death in greek. :(