I've had conversations with many donors about the question of "Will vaccinating children/fighting TB/etc. lead to population growth?"  I've usually responded that the conventional wisdom among scholars seems to be that improving health is likely to reduce population growth, not increase it.  However, this TED talk reduces my confidence in that view:

He is arguing for the conventional wisdom and showing that healthier countries have slower population growth both across-time and across-countries, but he keeps explaining exceptions to the pattern with things like "Strong health but poor women's rights" or "Strong health but didn't yet get into the family planning revolution."  Implies to me that external interventions directed at vaccination could create quite different patterns from the observed patterns of organic economic development.

We are going to have to look into this more at some point - not sure when.  I still think a lot of other dots need to be connected before I'd be ready to count population growth as a "harm" of vaccination campaigns, even if it is an effect of them.  But I thought I'd share this.  The video is fun, by the way.