... vaccinated for chickenpox and rubella before considering or attempting to become pregnant. Fact sheets for each of the above diseases are included in this section. For more information, call ... occurs in the first half of pregnancy. Prevention and Control of Communicable Diseases A Guide for School Administrators, Nurses, Teachers, Child Care Providers, and Parents or Guardians ... diarrhea has stopped and the child is well enough to participate in routine activities. Prevention and Control of Communicable Diseases A Guide for School Administrators,...