Immunisation: Why we do it and how 'herd immunity' works

This is how vaccines work, why they’re important and what the phrase “herd immunity” actually means.

from BBC News - World https://bbc.in/2WLYzXj
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Wild market swings as tariffs rattle US economy

Stocks swung sharply in the US, as Trump offered mixed signals about appetite for trade talks. from BBC News https://ift.tt/fqU8CPD