Objectives: The objective of this cross-sectional survey study was to investigate the prevalence, severity, and duration of post-COVID symptoms, with a specific focus on olfactory dysfunction. The study aimed to compare different virus variants of concern and explore potential associations between modifiable and non-modifiable risk factors and the prevalence or severity of symptoms. Materials and Methods: The study involved former hospitalized patients at Coburg REGIOMED hospital, with data collected through a voluntary and anonymous survey. Participants were asked to provide informed consent. A comprehensive questionnaire collected demographic and health data related to their COVID-19 infection. Data collection was conducted through an online platform and remained accessible from September 2022 to December 2022. The dataset included survey responses supplemented with data from clinical records. Results: The study population consisted of 1,025 participants, with a relatively balanced representation of males and females. The mean age for the entire population was 70.09 years. Significant variations in age were observed across different phases of the study. From the initial study population, 147 individuals participated in the survey, with a response rate of 14.3%. The demographics of the respondents were generally younger compared to non-respondents. Regarding olfactory dysfunction, there was no significant association between gender and the sense of smell. Interestingly, we discovered a correlation between the virus variant and the occurrence of olfactory dysfunction. The prevalence of this dysfunction decreased as we moved from the wild-type variant to the omicron variant. The duration of olfactory dysfunction did not show a significant association with gender or the phase of COVID-19. However, there was a trend indicating that individuals without olfactory dysfunction tended to be older on average. Vaccination status showed a potential association with olfactory dysfunction, with a higher percentage of individuals without dysfunction in the vaccinated group. Smoking status and alcohol consumption did not significantly influence olfactory dysfunction. There was a significant association between olfactory dysfunction and gustatory dysfunction. Associations were also found between olfactory dysfunction and concurrent symptoms such as headache, fatigue and concentration difficulties. 72 Conclusion: The study provided insights into the prevalence, severity, and duration of postCOVID symptoms, particularly olfactory dysfunction. The findings suggested potential associations between vaccination status, age, and the occurrence of olfactory dysfunction. However, further investigation with larger sample sizes and consideration of additional factors is necessary to establish conclusive relationships. The study highlighted the need for continued research on post-COVID complications to enhance our understanding of long-term effects and potential influencing factors.