Cavalcante, T.; Barboza, W.; Martins-Filho, P. R. The Vaccination Status of COVID-19 Hospitalized Patients During the Omicron BQ.1.1 Wave in Northeast Brazil Suggests the Need for a Fifth Booster Dose in the Elderly, With a Time since the Last Dose of More Than 6 Months . EXCLI J. 2023, 22, 169-172.