Instruct: Classify the given review into positive or negative sentiment.
Query: Excellent

I purchased the initial edition some years back when that one originally came out, and purchased this new one recently to brush up on immunodeficiencies and they added some new cases/updated old ones based on recent litterature. This is a fantastic book, period. Great diagrams and pictures, with case presentations and very well written text. A great book to learn about immunology/immunodeficiencies.