(a) Serologic confirmations of immunity to measles, rubella, mumps, hepatitis A, hepatitis B, or varicella, are acceptable. Evidence of measles, rubella, mumps, hepatitis A, or hepatitis B, or varicella illnesses must consist of a valid laboratory report that indicates confirmation of either immunity or infection.(b) A written statement from a parent (or legal guardian or managing conservator), school nurse, or physician attesting to a child's/student's positive history of varicella disease (chickenpox), or of varicella immunity, is acceptable in lieu of a vaccine record for that disease (see form at http://www.dshs.state.tx.us/immunize/docs/c-9.pdf).