我从western australia health department 的网站上关于BCG疫苗的information pamphlet 上看到的
How effective is the vaccine?
• BCG vaccination reduces the risk of TB in people who are not already infected
with TB. The vaccine does not always prevent TB disease. It is more effective in
young children, providing 50 to 80 % protection against meningeal and miliary
TB.
• Protection against TB will only start 6-8 weeks after the vaccination has been
given and lasts for about 10 years.
• Revaccination is not recommended.