>>708の補足
実はClément de ChaisemartinとLuc de Chaisemartin によるスウェーデンの
BCG出生時接種が感染率低減効果が無いとする論文
https://arxiv.org/ftp/arxiv/papers/2006/2006.05504.pdf
に示されたグラフ(Figure 1)とBCG Wold Atlas のスウェーデンの説明
http://www.bcgatlas.org/index.php
>Details of changes
>1965: Stopped revaccinations at 7 years of age;
>1975: General vaccination of newborns replaced by selective vaccination of at-risk groups;
>1986: Stopped revaccinations at 15 years of age;
>1979: Stopped boosters for military conscripts;
>1975: Stopped mass mandatory vaccination and targeted only at-risk groups;
>1993: Vaccination of at-risk groups postponed to 6 months after birth
>(however, infants with immediate risk of exposure are still vaccinated at birth)

を照合すると複数回接種で感染率が下がっている可能性が読み取れた。