Another two Papatoetoe High School students have covid 19

They are siblings.

One is a classmate of a girl ... who's in quarantine with her mother and father, with the virus.

Director-General of Health Dr Ashley Bloomfield told a select committee the new case was treated as a close contact - and isolating with her family members.

He says it's most likely the chain of transmission is from the first student, to her classmate ... and on to that student's brother.