“…At the individual level, studies found that various demographic characteristics, such as race [15,16], age [17][18][19], sex [16,18,19], education level [20], and economic status [21], are reasons for vaccine hesitation. In addition, other factors include the cognition of disease [22,23], parental attitudes [8,24], side effects [23,25,26], moral intuition [27], the seasonality and number of childbirths [28,29], trust in health professionals [23,30], vaccination history [31,32], and fear of needles [33].…”