We live in Jersey, UK, a small island, so we don't have many of those problems. An infection is possible. All the blood tests have come back clear, showing no particular infections. She was pretty good today - bouncy, lively - but her white blood cells and creatinine are a problem, Our vet is struggling to work it out and he is a very good vet. Piper had parvovirus when she was 10 weeks old and survived it.
Yes, you might be right. We will mention it to our vet. The biopsy is the next option - either that or get to the UK for an MRI or x-ray. Vets in Jersey all seem to agree that ticks are not dangerous. Being an Island in the UK, many of those diseases don't reach us. We are trying to avoid the biopsy, as her kidneys are still weak and the anaesthetic could be dangerous.