My Father was infected with Covid post covid vaccination first dose. Time line was as below: 1-Apr-2021 - Vaccinated with first dose 3-Apr-2021 - Developed high fever but fever came down after paracetamol

5-Apr-2021 - Again had fever and this time it was too high(~ 101F), did covid antigen test and report came positive

6-Apr-2021 - Admitted to Hospital and started treatment, HR CT was done and it was 9/25. 13-Apr-2021 - Discharged from Hospital and home isolation started. 24Apr-2021 - Home isolation ends as CRP report came negative When my father should go for 2nd dose of Covid Vaccine? Appreciate any help in this regard.