Regarding the mean differences of GAD-7 shown in Table 2, our results suggested that no any statistically significant difference was found in terms of gender, vaccination status, infection status of participants from outside Shanghai, view of coexistence with COVID-19, psychological fear toward friends infected with COVID-19 within groups (i.e., Non-Shanghai area (China), Shanghai (China), and North America and Western Europe; all p > 0.05), except for subjective attitudes of participants toward the sequelae of Omicron (all p < 0.05). Here, GAD1 is linked to infection.