Correct: West Nile virus (WNV; family Flaviviridae, genus Flavivirus) is transmitted to humans [here the virus is being transmitted, not the species name; so West Nile virus is roman type and may be abbreviated].or human coronavirus, use the abbreviation hCoV. Be aware that there is a genus/species named Human coronavirus, which should be abbreviated as H. coronavirus, not hCoV. For numbered echoviruses (e.g., echovirus 13), use the following format: E13 (do not use EV). For hepatitis E virus, use the acryonym HEV.
Muscle twitching is caused by minor muscle contractions in the area, or uncontrollable twitching of a muscle group that is served by a single motor nerve fiber. Muscle twitches are minor and often go unnoticed. Some are common and normal. Others are signs of a nervous system disorder.
Smooth muscle fibres or the involuntary muscle fibres are responsible for involuntary movements. Example, heart muscle.