Hello, I have 2 10 month old Birman kittens, I got them both together from the same breeder, both were vaccinated and in good health. Charlie developed a respiratory infection (sneezing, watery eyes, mucus from his nose) at the end of September which slowly got worse until he was going off his food so the vet gave antibiotics, 3 days after the injection wore off he started getting poorly again. So the vet gave a longer course of antibiotics, then he had a stronger antiobiotic and so on. We even tried a course of anti-histamines to make sure it wasn't an allergy to something. Every single time the antibiotics work and Charlie returns to being his normal happy self but within days starts getting poorly again. Each time he gets poorly the symptoms get worse and he is now getting diarrhea too, once with blood in it. The vet is confused as she says diarrhea isn't usually a symptom seen alongside respiratory diseases. The vet has done several blood tests, nasal swabs, she has taken urine and faecal samples but cannot find anything majorly wrong with him. She has ruled out all the 'normal' causes such as feline herpes and calicivirus etc, they tested his red and white blood cells and his liver. The thing that has baffled her the most is that my other kitten has not had any problems at all. The vet seems to have now given up and just said he'll have to go onto antibiotics long-term which I'm not keen on as it's only a few days between each course now as the symptoms return very quickly. So I am wondering if anyone in here has any ideas? Have any of your cats suffered similar symptoms? What helped? I suggested natural remedies to the vet but she was very dismissive and I have no idea about it at all. I did search online but there doesn't seem to be any natural/holistic vets in my area. I don't know what else to do.