The thrush was resistant to anti-fungal medications, even oral ones. (babycenter.com)
I always recommend that cats who aren't eating get some type of veterinary intervention (such as subcutaneous fluids given with a needle under the skin, or injectable medications if they can't keep oral ones down), as they can decline pretty quickly. (goodpetparent.com)
In the riskiest places, the teams give the injectable polio vaccine in addition to the oral one. (sciencemag.org)