The severity of these complications correlates with the dosage, duration of use, and the potency of the steroid prescribed. While the incidence of steroid-induced myopathy does not appear to be directly related to the dosage of steroid prescribed nor the duration of use, it appears to be more prevalent with the use of steroids containing a 9-alpha fluorine configuration, such as triamcinolone (Aristocort®). The relationship between hypertensive side effects and the duration of therapy is also not very clear; steroids should be prescribed with greater caution in the elderly, in those individuals with known hypertension, and when compounds with greater mineralocorticoid properties are prescribed. As hyperglycemia is a well-known complication of corticosteroid use, oral steroids should be prescribed with caution in the diabetic population.
FCoV is a virus of the gastrointestinal tract: most infections are either asymptomatic, or cause diarrhea,especially in kittens as maternally derived antibody wanes at between 5-7 weeks of age. The virus is often referred to as feline enteric coronavirus (FECV). From the gut, the virus very briefly undergoes a systemic phase,  returning to the gut, from where it is shed in the faeces. The pathogenesis of FIP is complicated: the reductionist view is that it is entirely due to mutation of the virus, enabling it to enter, or replicate more successfully in, monocytes.  The holistic approach is that FIP occurs as a result of a number of factors, including viral virulence (some strains are undoubtedly more virulent than others), and the immune status and general health of the host.