D.C. Mun. Regs. tit. 22, r. 22-B145
A student under thirteen (13) years of age who has not received primary immunization shall receive one (1) dose of varicella vaccine. Beginning with the 2008/2009 school year, a student under thirteen (13) years of age shall receive a second dose of varicella administered at three (3) months and by four (4) months after the previous dose. If the second dose was given twenty-eight (28) days or more after the first dose, then the second dose does not need to be repeated. Varicella shall not be administered within twenty-eight (28) days of receiving a dose of MMR, one of the single-antigen measles, mumps, or rubella vaccines, or any other live parenteral vaccine, unless administered on the same day.
A student thirteen (13) years of age or older who has not previously received a varicella vaccine shall receive two (2) doses administered not less than twenty-eight (28) days and not more than two (2) months apart. Varicella shall not be administered within twenty-eight (28) days of receiving a dose of MMR or one of the single-antigen measles, mumps, or rubella vaccines, unless administered on the same day.
Beginning with the 2008/2009 school year, a student thirteen (13) years of age or older who has previously received one (1) dose of varicella vaccination shall receive a second dose not less than twenty-eight (28) days and not more than two (2) months after the previous dose. Varicella shall not be administered within twenty-eight (28) days of receiving a dose of MMR or one of the single-antigen measles, mumps, or rubella vaccines, unless administered on the same day.
Varicella doses administered before the age of seven (7) may satisfy the requirements of §§ 145.1, 145.2, or 145.3, unless given before twelve (12) months of age or at an interval of less than twenty-eight (28) days between doses.
The varicella vaccination shall not be required for a student who has written certification of infection with varicella that includes either:
D.C. Mun. Regs. tit. 22, r. 22-B145