Understanding and Explaining Viral Vector COVID-19 Vaccines.The minimum order size and increment for Janssen COVID-19 Vaccine is 100 doses (2 cartons of 10 multidose vials, 5 doses per vial) per order.Janssen COVID-19 Vaccine is authorized and recommended for persons 18 years of age and older.The recommendation for the Janssen COVID-19 Vaccine should be implemented in conjunction with the Advisory Committee on Immunization Practice’s (ACIP) interim recommendations for allocating initial supply of COVID-19 vaccines.All people for whom vaccination is indicated should receive 1 dose.Store Janssen COVID-19 Vaccine in the refrigerator between 2°C and 8°C (36°F and 46°F) for up to the expiration or beyond use date (BUD).The expiration date is NOT.