The date schools can exclude students from attending because of incomplete immunization records is Wednesday, Feb. 19, 2014. Coos Co. Public Health Clinic Supervisor Lena Hawtin says they mailed out 461 exclusion letters to parents or guardians of students attending public schools in Coos County this school year who have incomplete records. That’s up from the 436 mailed out last year, which resulted in 29 exclusions.