What is the recommended vaccination schedule for a person who received only the Janssen COVID-19 Vaccine?

Janssen (Johnson & Johnson) COVID-19 vaccine is no longer available for use in the United States. The last remaining doses expired May 7, 2023. People age 18 years or older who received 1 or 2 Janssen COVID-19 Vaccine doses are recommended to receive one 2023–2024 Formula dose (Moderna, Pfizer-BioNTech, or Novavax).