HCN4 and viral infectious disease: Out of 18 functionally related taste genes, statistically significant differences were observed for HCN4 variants c∗2393C > G (p = 0.013) and c.2556G > A (p = 0.026), PLCB2 variants c.3037-55T > C (p = 0.019) and c.582+958_582+959inv (p = 0.021), and TAS1R1 variant c.1594+41G > A (p = 0.03), which indicate possible association to taste dysfunction in response to virus infection.