MBTPS1 and infection: Categorising titres into non-responder (<0.8 U/mL), responder (0.8–5000 U/mL), and high-responder (>5000 U/mL) upon ≥1 booster vaccinations or infections after initial immunisation, the proportion of non-responders in ns-S1P dropped from 12.9% to 11.8%, with an increase in high-responders from 6.5% to 11.8%.