“Humming Heroes” was a #1 Amazon bestseller in Communicable Diseases. This outstanding achievement would not have been possible without the support of many followers, and we are sincerely grateful to each and every one of you.

The ebook is available for purchase on Amazon for $4.99. For those interested in a physical copy, a softcover edition of “Humming Heroes” is priced at $15.99, and it can be shipped worldwide.