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Association between antibody titer peak at T2 versus T3 minus T2 variation in the seronegative groups (n = 958). Red dots (n = 62) represent the small HCPs with an antibody titer increase between T2 and T3. Blue dots (n = 213) represent the HCPs showing an antibody titer >2500 U/mL at T2 or T3. Empty dots (683) represent HCPs with an antibody titer decrease between T2 and T3. The green line represents the linear regression analysis.
