borderline significantp = 0.064
Serotype 4 showed a borderline significant decrease between 2015–2017 and 2018–2020 ( p = 0.064); however, this trend was not sustained in subsequent years.
Serotype 4 showed a borderline significant decrease between 2015–2017 and 2018–2020 ( p = 0.064); however, this trend was not sustained in subsequent years.
Notably, PCV20, but not PCV15, includes serotype 8, which has shown an increasing trend in IPD cases among adults in Lithuania.
Other non-vaccine serotypes, such as 23A and 35F, were detected more frequently in later years; however, most did not reach statistical significance, likely due to small case numbers or variability across years. 3.3 Invasive pneumococcal serotype distribution by age groups During the pre-vaccine period, a diverse range of serotypes caused IPD in children, with serotype 14 (22.5%) and serotypes 6A plus 6B (19.4%) being the most prevalent ( Table 2 ).