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inclusion criteria: cohort 1: participant received ad26.cov2.s in vac31518cov3001. the interval between the ad26.cov2.s primary vaccination should preferably be greater than or equal to (>=) 6 months prior to study vaccination on vac31518cov2008, however a window of maximum -20 days is allowed; cohort 2: participant completed primary vaccination with a 2-dose regimen of bnt162b2 vaccine. the last dose of btn162b2 should preferably be >=6 months prior to study vaccination on cov2008, however a window of a maximum of -20 days is allowed participant must provide consent indicating that he or she understands the purpose, procedures and potential risks and benefits of the study, and is willing to participate in the study participant agrees to not donate bone marrow, blood, and blood products from the study vaccine administration until 3 months after receiving the study vaccine participant must be willing to provide verifiable identification, has means to be contacted and to contact the investigator during the study participant must be able to read, understand, and complete questionnaires in the electronic clinical outcome assessment (ecoa) (that is, the coronavirus disease (covid-19) signs and symptoms surveillance question, the e-diary, and the electronic patient-reported outcomes (epros). participants with visual impairment are eligible for study participation and may have caregiver assistance in completing the ecoa questionnaires

inclusion criteria: cohort 1: participant received ad26.cov2.s in vac31518cov3001. the interval between the ad26.cov2.s primary vaccination should preferably be greater than or equal to (>=) 6 months prior to study vaccination on vac31518cov2008, however a window of maximum -20 days is allowed; cohort 2: participant completed primary vaccination with a 2-dose regimen of bnt162b2 vaccine. the last dose of btn162b2 should preferably be >=6 months prior to study vaccination on cov2008, however a window of a maximum of -20 days is allowed participant must provide consent indicating that he or she understands the purpose, procedures and potential risks and benefits of the study, and is willing to participate in the study participant agrees to not donate bone marrow, blood, and blood products from the study vaccine administration until 3 months after receiving the study vaccine participant must be willing to provide verifiable identification, has means to be contacted and to contact the investigator during the study participant must be able to read, understand, and complete questionnaires in the electronic clinical outcome assessment (ecoa) (that is, the coronavirus disease (covid-19) signs and symptoms surveillance question, the e-diary, and the electronic patient-reported outcomes (epros). participants with visual impairment are eligible for study participation and may have caregiver assistance in completing the ecoa questionnaires

inclusion criteria: cohort 1: participant received ad26.cov2.s in vac31518cov3001. the interval between the ad26.cov2.s primary vaccination should preferably be greater than or equal to (>=) 6 months prior to study vaccination on vac31518cov2008, however a window of maximum -20 days is allowed; cohort 2: participant completed primary vaccination with a 2-dose regimen of bnt162b2 vaccine. the interval between the last dose of btn162b2 should preferably be >=6 months prior to study vaccination on cov2008, however a window of maximum -20 days is allowed participant must provide consent indicating that he or she understands the purpose, procedures and potential risks and benefits of the study, and is willing to participate in the study participant agrees to not donate bone marrow, blood, and blood products from the study vaccine administration until 3 months after receiving the study vaccine participant must be willing to provide verifiable identification, has means to be contacted and to contact the investigator during the study participant must be able to read, understand, and complete questionnaires in the electronic clinical outcome assessment (ecoa) (that is, the coronavirus disease (covid-19) signs and symptoms surveillance question, the e-diary, and the electronic patient-reported outcomes (epros). participants with visual impairment are eligible for study participation and may have caregiver assistance in completing the ecoa questionnaires

inclusion criteria: cohort 1: participant received ad26.cov2.s in vac31518cov3001. the interval between the ad26.cov2.s primary vaccination should preferably be greater than or equal to (>=) 6 months prior to study vaccination on vac31518cov2008, however a window of maximum -20 days is allowed; cohort 2: participant completed primary vaccination with a 2-dose regimen of bnt162b2 vaccine. the interval between the last dose of btn162b2 should preferably be >=6 months prior to study vaccination on cov2008, however a window of maximum -20 days is allowed participant must provide consent indicating that he or she understands the purpose, procedures and potential risks and benefits of the study, and is willing to participate in the study participant agrees to not donate bone marrow, blood, and blood products from the study vaccine administration until 3 months after receiving the study vaccine participant must be willing to provide verifiable identification, has means to be contacted and to contact the investigator during the study participant must be able to read, understand, and complete questionnaires in the electronic clinical outcome assessment (ecoa) (that is, the coronavirus disease (covid-19) signs and symptoms surveillance question, the e-diary, and the electronic patient-reported outcomes (epros). participants with visual impairment are eligible for study participation and may have caregiver assistance in completing the ecoa questionnaires