Not sure what you mean by hidden but it can lie dormant for long periods of time.
A cold sore is caused by a virus.
Anyone, who comes into contact with the virus, can get a cold sore.
The cold sore virus gets transferred by direct contact (touching) the infected area.
The virus that causes cold sores in humans is an example of a hidden virus.
active virus
The virus can transfer from a cold sore on a lip to the vagina.
Cold sores result from infection with the herpes virus.
They can be transferable you don't have a cold sore at the time (most of us are infected with the virus).
It's a type of herpes.
It would be nearly impossible to get a cold sore from a telephone as the virus can't survive long outside of the body.
A cold sore can't lead to herpes simplex two; they are a different virus.
Cold sores are spread by skin-to-skin contact with an infected person, at the location where the virus is active, during a time when they are shedding virus. If a girl has a cold sore, and you kiss her genital area (where no sore is) but not her mouth (where the sore is), you are not likely to get infected.