I understand your surprise oramar.
In 24 years of raising kids who went to daycare & public schools & 14+ years as a nurse I never heard of Hand, Foot & Mouth until I went to work in a Peds office. We saw probably 25 kids a week with it.
Same with Fifths...I had at heard of but never saw it until the clinic.
Both are now considered common childhood illnesses.
What comes to mind is keep the blisters clean & dry if they pop and watch for secondary infection.
Feed soothing foods (popcicles are great), if the mouth sores are painful or interfere with eating a bit of Baby Oragel applied with a Q-Tip helps.
NO asprin, give Tylenol or Ibuprophen and good handwashing by all who come in contact with body fluids.
Have you seen the CDC fact sheet? http://www.cdc.gov/ncidod/dvrd/revb/...virus/hfhf.htm