(1) The initial attendance of every student at every private school in the state is conditioned upon proof of immunization as set forth in RCW 28A.210.080.

(2) The chief administrator of each private school shall prohibit the further presence at school of each student already in attendance and who has failed to provide proof of immunization in accordance with RCW 28A.210.080(1). Such exclusion shall be preceded by written notice as set forth in WAC 180-38-050. If written notice has not been provided, any exclusion shall be stayed until notice is received by a parent, guardian or other adult in loco parentis.