FIG 2.
Correlation of IgG antibodies in serum and saliva with a Spearman rank test. (a and b) Total vaccinated population correlation of IgG antibodies in serum and saliva at 2 and 6 months after the first vaccine dose, respectively. (c and d) Correlation of IgG in serum and saliva in previously infected individuals at 2 and 6 months after the first vaccine dose, respectively. (e and f) Correlation of IgG in serum and saliva in infection-naive individuals at 2 and 6 months after the first vaccine dose, respectively. P values of <0.05 are considered significant.