For parents, finding out that a child was given an ineffective vaccine is perhaps just as unsettling.
''You think it should have been handled better,'' Hector Diaz said. ''That's scary, the fact that a mistake like that could have happened.''
The mistake happened at the Staten Island Physician Practice.
According to the city health department, the medical facility stored vaccines at improper temperatures.
The health department believes the vaccines could be ineffective.
The vaccines include those for measles, mumps, rubella, hepatitis A and Guardasil.
The health department says the problem developed when the vaccines were stored in a refrigerator at the wrong below freezing temperatures.
The facility has reportedly fixed the problem. Officials are offering to revaccinate the children.