A brilliant book that thoroughly deserves a five-star rating. The reason I gave it only four was because in one single but important respect the author hasn't done his research properly, and has relied for his information about ebola on a single, and apparently authoritative, book by another author, who also didn't do his research.
The ebola virus, contrary to popular belief, doesn't 'attack every organ in the human body apart from bone and skeletal muscle'. This is a statement that has been widely promulgated, and it is wholly false. Ebola actually only attacks the circulatory system, and only two components of that. It targets the platelets, responsible for blood clotting, and the endothelial cells which line the inside of veins and arteries and essentially keep the blood inside. It launches, in effect, a two-pronged attack; the circulatory system begins to leak as the endothelial cells fail to function, and the blood which leaks out doesn't clot.
That criticism apart, this book was meticulously researched, very well written, and thoroughly enjoyable. Michael Slade is clearly a highly-accomplished and extremely readable author.