Probably an issue with the tracking chip.

A Fairbanks health care worker was treated for a “probable” serious allergic reaction on Thursday after she received the COVID-19 vaccine, according to the Foundation Health Partners care system.

Additionally, on Friday evening, Providence Alaska reported that two caregivers who received the COVID-19 vaccine experienced non-life-threatening, mild reactions.

In total, five Alaskans have experienced adverse reactions this week after receiving the vaccine. Two Bartlett Regional Hospital employees in Juneau experienced reactions after the vaccine, one serious and one mild.

Providence Alaska spokesman Mikal Canfield said that due to privacy laws, they could not provide additional information. But the three other health workers who experienced reactions to the vaccine all are doing well. None are still hospitalized, and the three workers have recommended that others continue to receive the vaccination — which is expected to be one of the most important tools in ending the pandemic, officials say.

The Fairbanks worker started to show what hospital officials described as “traditional anaphylactic symptoms,” including tongue swelling, voice hoarseness and difficulty breathing, roughly 10 minutes after getting vaccinated, Foundation Health Partners spokeswoman Kelly Atlee wrote in an emailed statement Friday morning.