Strunk and White - The elements of style you can read it cover to cover, but also just come back every now and again to look at what you can further improve. I find I pick 1-2 things each major project to focus on.
Initially I focused on removing 'that' from things.
Then i focused on ensuring my sentences have a single point.
I think when you compare the scale and scope of SARS with the WNV, I think there should be slightly less finger pointing. The US, North America and Europe are not immune to sharing their viruses globally. Lets not pretend 'the west' has the problem of virus control sorted. It starting there less often because there are less wild and animals around.
Victoria University in Australia has moved to a block model, where students do 1 course at a time, in 4 weeks. Sit the exam/assessment and then move onto the next. They do 8 courses a year (Standard Full time Australian study load)
Initially I focused on removing 'that' from things. Then i focused on ensuring my sentences have a single point.
Pick 1-2 things and get good at them, then move on. https://en.wikipedia.org/wiki/The_Elements_of_Style