Good scientific language: Seroprotection

Definition Seroprotection refers to the situation in which an individual, following vaccination or natural infection, achieves a serologically measurable antibody concentration or titer that has been designated by regulatory or scientific authorities as sufficient to provide clinical protection against infection or disease. These thresholds—often referred to as “correlates of protection”—serve as quantitative immunological benchmarks in vaccine development, licensure, and post-marketing surveillance. In some instances, such seroprotective antibody thresholds, if achieved by a new, yet to be licensed product, may allow vaccine licensure without the need to conduct an efficacy study. The newly developed pneumococcal conjugate vaccines (PCV15, PCV20) are recent examples of the principle, as the licensed PCV13 served as the competitor. Importantly, seroprotection is not a direct biological guarantee of individual protection but rather a statistical correlation derived from population-level data linking antibody concentrations to a reduced risk of infection. Vice versa, a lack of detectable antibodies against e.g,. varicella does...