At least 44 emergency department workers at a Kaiser Permanente emergency room in San Jose have tested positive for COVID-19 over the last week.
The outbreak reportedly took place after a staff member appeared in the emergency department wearing an inflatable, air-powered, Christmas-themed costume.
Kaiser said they're investigating the costume's role in the outbreak.
"Any exposure, if it occurred, would have been completely innocent, and quite accidental, as the individual had no COVID symptoms and only sought to lift the spirits of those around them during what is a very stressful time," a Kaiser spokesperson said in a statement. "If anything, this should serve as a very real reminder that the virus is widespread, and often without symptoms, and we must all be vigilant."
Kaiser said the staff member was "well-intentioned" but wore the costume without advance notice or approval. Air-powered costumes are not allowed in Kaiser facilities, the spokesperson said.