Vidqun:
What measures are you here referring to? Might one be the wearing of masks?Masks have shown to be somewhat effective at reducing a wearer who is already infected from infecting others, but are not as effective at preventing an uninfected wearer from getting infected. It should be somewhat obvious that something covering the nose and mouth might make at least some difference, but people generally end up touching their mouth/nose/eyes, and then touch other surfaces, circumventing the benefit of the mask. (And though I’ve said clearly here that masks aren’t so good at preventing infection, some moron will probably say something to the effect of “He said the word ‘masks’! I knew he meant masks.”)
But isolation is the best measure. Basic hygiene doesn’t hurt either.