a decreasing trendp < 0.001
All‐cause 30‐day mortality due to BM The overall 30‐day mortality of BM was 9% (981/10,771); it was 3% in children and 14% in adults, with a decreasing trend since 1987 in adults, particularly among the elderly (annual change −2%, CI95% −4 to −1, p < 0.001), but also among nonvaccinated adults (annual change −3%, CI95% −5 to −2, p < 0.001) (Fig.