Recurring hand foot mouth virus? is that possible?

Yes: Although hfm is most often associated with coxsackievirus a16, the process does occur with other enteroviral strains (enterovirus 71 & others). A child will develop immunity to an individual strain after an illness but be susceptible to other unrelated strains, much like there are different strains that cause the flu.

Yes: Hand foot and mouth disease is usually self limited and a rise serun antibodies eliminates the viremia in 7-10 days. Some cases can be prolonged or recurrent.