(NBCPHILADELPHIA) — An audit found five South Jersey children were likely given the wrong immunizations during a Salem County-sponsored “Shots for Tots” clinic, health officials said. The most egregious error, officials said, was when a toddler boy was likely given an excessive dose of a cervical cancer vaccine.

The free clinic was operated by the Salem County Health Department at Memorial Hospital of Salem County in Mannington Township, officials said. It has since been shut down.

Officials reviewed 22 patient records during an annual audit and found irregularities with shots given to at least five children between July 2014 and June 2015.

A nurse was fired after officials learned a 2-year-old boy was injected with a high dose of Gardasil, the cervical cancer vaccine. The child’s mother and pediatrician were notified late last month, officials said.

Note: Read our discussion guidelines before commenting.