Wyo. Stat. § 21-4-309 (2026)

schools; exceptions.

     (a) Any person attending, full or part time, any public or
private school, kindergarten through twelfth grade, shall within
thirty (30) days after the date of school entry, provide to the
appropriate school official written documentary proof of
immunization. For purposes of this section, documentary proof
of immunization is written certification by a private licensed
physician or his representative or by any public health
authority, that the person is fully immunized. Documentation
shall include month, day and year of each required immunization
received against vaccine preventable disease as designated by
the state health authority.   No school administrator shall
permit a student to attend school for more than thirty (30)
calendar days without documentary proof of immunization. If
immunization requires a series of immunizations over a period of
more than thirty (30) calendar days, the child shall be
permitted to attend school while receiving continuing
immunization if the school administrator receives written
notification by a private licensed physician or his
representative or by a public health official, specifying a
written schedule for necessary immunization completion within
the medically accepted time period. Waivers shall be authorized
by the state or county health officer upon submission of written
evidence of religious objection or medical contraindication to
the administration of any vaccine. In the presence of an
outbreak of vaccine preventable disease as determined by the
state or county health authority, school children for whom a
waiver has been issued and who are not immunized against the
occurring vaccine preventable disease shall be excluded from
school attendance for a period of time determined by the state
or county health authority, but not suspended from school as
provided in W.S. 21-4-305. Children excluded from school
attendance under this section shall not be counted in the
aggregate number of pupils absent as defined in W.S.
21-13-101(a)(i).

     (b) The school administrator shall be responsible for an
audit of the immunization status of any child enrolled in the
school in accordance with rules and regulations prescribed by
the department of health.

     (c) The written documented proof of immunization on a form
provided by the state health officer shall be an integral part
of the child's school record.

    (d)   For purposes of this section:

          (i) "State health officer" means the person appointed
by the governor pursuant to W.S. 9-2-103(e);

          (ii) "County health officer" means the licensed
medical officer designated by the county commissioners to serve
as health officer for his county;

          (iii) "Immunized" or "immunization" means initial
immunization and any boosters or reimmunizations required to
maintain immunization pursuant to the immunization standards and
recommendations issued by the state health officer.