Anyone got any ideas of how I can get rid of persistent oral thrush? The GP has run blood tests and they all came back with no issues, but the thrush has been on and off for 6 months now. It started when I did 12 weeks on the Cambridge 1:1 diet and began daily swimming in an indoor pool. I have had fungal infections in various parts over the years and they often take a while to go. If my immune system isn’t deficient, what could be going on?