It suggests
that BCG vaccination may have little or no causal link to infection rates
It suggests that BCG vaccination may have little or no causal link to infection rates and advises that any follow up studies should control for several confounding factors , such as population age , ethnicity , rates of certain chronic diseases , time from community spread start date , major public policy decisions and income levels .
It suggests that BCG vaccination may have little or no causal link to infection rates and advises that any follow up studies should control for several confounding factors , such as population age , ethnicity , rates of certain chronic diseases , time from community spread start date , major public policy decisions and income levels .