Based on the latest evidence of COVID-19 vaccines, there are new recommended dosing schedules for people who are moderately or severely immunocompromised.
In summary, the new guidance for COVID-19 vaccination of immunocompromised patients states:
People who initiated vaccination with Johnson & Johnson’s Janssen COVID-19 vaccine should receive a total of 3 doses: 1 Johnson & Johnson’s Janssen dose, followed by 1 additional mRNA dose at least 28 days later, then 1 booster dose at least 2 months after the 2nd (additional) dose. mRNA vaccines are preferred for the booster.
People who received a 3-dose mRNA COVID-19 vaccination series should receive the booster dose 3 months after the primary series (instead of 5 months after the primary series).
Table 3: COVID-19 vaccination schedule for people with moderate or severe immunocompromise*
https://www.cdc.gov/.../clin.../covid-19-vaccines-us.html...