Auckland Regional Public Health Service (ARPHS) is now asking everyone at Chapel Downs Primary School get tested as a precaution following a positive COVID-19 case.
ARPHS says the student was only at school for half an hour on Monday and there are very few close contacts.
"However, the vast majority of the school are being asked to stay away from others outside the home until they are tested and receive a negative result," a spokesperson said.
"While casual contacts are at very low risk of developing COVID-19, Public Health has requested everyone at the school get tested and watch for symptoms."
"Understandably some parents may be upset that they did not hear until Wednesday, however this information was shared as soon as events were confirmed on Wednesday."
As a result of the case, the school will close until next Monday "at the earliest" to allow for deep cleaning and close contacts to be identified.
"ARPHS decided to close the school while it investigated the movements of the child and the risk to others," the spokesperson said. "ARPHS also needed to identify any close contacts who are at higher risk and need to be in self-isolation.
"The child who was briefly at school was not symptomatic, but was waiting for results from a COVID-19 test from September 13. The child left school before children began classes for the day, further reducing the risk to the school community."
ARPHS has liaised with family members to communicate the importance of self-isolating, the spokesperson said.
"Members have been tested and have stayed in isolation until this event.
"Please respect the family's privacy."