The possible role of viruses in feline liver disease has long remained neglected.However, in 2018, an analogue of human hepatitis B virus was identified in cats.Moreover, antibodies for Neck Serum human hepatitis E have been detected consistently at various prevalence rates in cats.
Although the correlation between these viruses and the B12 Vitamins / Methylcobalamine liver injury in cats must be clarified, hepatotropic viruses might represent an increasing risk for feline and public health.