NACI Summary of Extended Dose Intervals Statement of April 7, 2021 Post author By National Advisory Committee on Immunization Post date 16 September 2021 Summary of Extended Dose Intervals Statement of April 7, 2021. ← Vaccine-Induced Prothrombotic Immune Thrombocytopenia (VIPIT) Following AstraZeneca COVID-19 Vaccination → COVID Discussions