California health officials are calling on COVID-19 vaccine providers to stop using a batch of Moderna’s shots after a handful of people who were inoculated at the same site all had allergic reactions.

“All appeared to be experiencing a possible severe allergic reaction during the standard observation period – a type of adverse event that the CDC reports some people have experienced when receiving a COVID-19 vaccine.

The vaccine site switched to another lot of Moderna vaccine after closing for a few hours,” the California Department of Public Health said.

“Out of an extreme abundance of caution and also recognizing the extremely limited supply of vaccine, we are recommending that providers use other available vaccine inventory,” the news release said

Officials noted that there is a degree of risk to any vaccine or medical procedure, and it’s highly unlikely anyone will suffer a negative reaction