It seems like eradication is a blunt instrument approach to the problem. We know that some people are much more likely to get bit. How can it be so hard to dete

It seems like eradication is a blunt instrument approach to the problem. We know that some people are much more likely to get bit. How can it be so hard to determine the differing factor?? To your point (and ignoring the extreme solution), why have we not put the requisite energy towards solving this problem?