SAN FRANCISCO (CBS) – Doctors in San Francisco are asking parents to look out for an aggressive virus among children.

The city has seen several cases of a new strand of hand, foot and mouth disease.

Medical experts say the virus is common among young children who frequent playgrounds and daycare.

It can lead to a rash, loss of appetite, fever and even cause fingernails and toenails to fall off.

The virus is also very contagious.

“I would guess one child in 5 to one in 10 who has had this disease has had a parent get it,” said pediatrician Dr. Dan Kelly.

The new strain does not seem to be more dangerous than the traditional disease, but experts are intrigued by the changing symptoms.

(Copyright 2012 by CBS San Francisco. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)


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