@elam84 I wonder if there’s enough cultural and epidemiological differences between countries that might explain this. Doesn’t seem like the discussion in this thread has wandered into this territory yet.
In the US, there are several religious communities that don’t vaccinate and a growing population of anti-vaxxers. In the past few decades, for example, there have been several
measles and
pertussis outbreaks that have been directly related to strict religious groups that don’t have any sort of significant herd immunity and don’t vaccinate (Amish, Orthodox Jewish, etc).
Maybe collectively there’s more likelihood of a family being affected by these diseases, so the regional rules are different than in areas that historically haven’t seen as many incidents? The US is a very big place, so having blanket recommendations for the bulk of the population probably significantly helps mitigate the potential for massive spread of very contagious diseases, especially to limit potential harm to very vulnerable populations like infants, who experience far higher mortality with those diseases than other age groups. That and also consider typical obesity patterns and how regular it is to have the average adult juggling a handful of comorbidities at once that might make them more susceptible to transmission and infectious spread.