NEW YORK, Nov. 2 (UPI) -- Four siblings attending a public school in New York have been diagnosed with the potentially dangerous infection known as MRSA.

Public School 106 in Far Rockaway was cleaned Wednesday as a precaution, officials said. But they told The New York Daily News there are no indications of a spike in MRSA infections in the city.

The four children have not been in school since they were diagnosed. Experts are unsure how they became infected.

MRSA -- a staphylococcus infection that is resistant to methicillin and other common antibiotics -- had been mostly a problem in hospitals but has become increasingly common outside.

A 12-year-old boy died of MRSA in Brooklyn, N.Y. His mother said a doctor at a clinic gave him an ineffective antibiotic, and that emergency room personnel at Kings County Hospital then misdiagnosed him as having an allergic reaction to the drug.