Not sure if I should consider the price/size in writing the review. Yes, as the other reviewer wrote, it's an expensive book, especially for its size, and the 3 star review is understandable.
But for those who can afford it or who can get it with a discount, in digital format or second hand, I would thoroughly recommend it. The book is basically a series of articles about different viruses which have played an important role in history or science but it all works together very well, and wider issues, the origins, types, evolution of viruses and how they work, are discussed in clear language and structure.
It's difficult to write meaningful positive reviews which avoid using the usual cliche adjectives (well written, informative, to the point etc etc) but I'm not sure how else to put it. I find this an excellent introduction which could appeal also to readers not particularly interested in the topic.