2.2.1. Participants
FOOD ALLERGY, ACUTE DISEASES, INFLUENZA
One hundred participants were Japanese adults aged ≥20 years and <65 years who provided written informed consent. Participants with any other chronic or acute diseases, drug or severe food allergy, those using any probiotic supplement or yogurt, individuals engaging in excessive alcoholic drinking, those who were vaccinated for influenza or COVID-19 within one month before screening, and those with any vaccination plans during the study were excluded. Additionally, participants who were deemed unsuitable for the study by the principal investigator or sub-investigator for any reason were also excluded.