Unlike the other vaccines so far approved by the European Medicines Agency, the Janssen COVID-19 vaccine requires only one single 0.5 ml dose to be administered intramuscularly. The maximum protective efficacy is reached from 14 days after vaccination.
There should be a minimum interval of 14 days between the administration of this vaccine and any other vaccine against other health conditions. This recommendation may be amended as data on co-administration with other vaccines become available.
Janssen COVID-19 vaccine requires only one dose.