PDE4DIP and COVID-19: After viral infection, the host's olfactory function cannot be restored in time after the damage and the sensitivity and specificity of the olfactory senses are reduced.[12] In patients with palpitations after COVID‐19, genes involved in cardiac contraction and relaxation, such as OBSCN, and PDE4DIP, had higher scores, suggesting a stable imbalance of CAMP/calcium in myocardial cells.