KDP categories · Top KDP authors
Viral (Diseases, Kindle eBooks): Amazon KDP category data
Amazon Kindle eBooks Best Sellers data for Viral (Diseases, Kindle eBooks), updated Nov 2, 2026: median price $5.99, median 4 reviews, average rating 4.5 and a KDPTop opportunity score of 20/100 (highly competitive).
| Price range (middle 50%) | $3.62 – $9.98 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 9% |
| Books on the list | 100 |
| Store | Kindle eBooks |
What stands out
- Its median reviews are 1% of the parent category Diseases (368), one of the easier corners under it.
- Its review barrier is lower than in 90% of Kindle eBooks categories: the median best seller has only 4 reviews, so new books can chart with few.
- Prices spread wide: the middle half runs from $3.62 to $9.98, so budget editions and premium or boxed sets sell side by side.
Top 10 Viral best sellers
-
Vaccines, Amen: The Religion of Vaccines
by Aaron Siri
- List rank#1
- Price$16.99
- Rating4.9
- Reviews774
-
The Ultimate Guide to Methylene Blue: Remarkable Hope for Depression, COVID, AIDS & other Viruses, Alzheimer’s, Autism, Cancer, Heart Disease, Cognitive ... Targeting Mitochondrial Dysfunction)
by Mark Sloan
- List rank#2
- Price$2.99
- Rating4.7
- Reviews3,787
-
The Flesh Eaters: The World's Deadliest Flesh-Eating Diseases
by J.D. Sherwood
- List rank#3
- Price$4.99
- Rating4.3
- Reviews54
-
EBOLA: The Virus, The History, The Global Threat A Comprehensive Guide - Updated with the 2026 Ituri Province Outbreak
by Charl Jooste
- List rank#4
- Price$6.99
- Rating4.0
- Reviews2
-
Faster Than the Virus: The Virus Booked First. Sick people fly, we just pretend they don't.
by A J
- List rank#5
- Price$0.99
- Rating2.0
- Reviews1
-
OUTBREAK Ebola, Hantavirus, and the Next Global Threat: From Spillover to Pandemic- A Dual Audience Guide for Healthcare Professionals and the Public
by Jesudass Alphonse Raj
- List rank#6
- Price$2.99
- Reviews-
-
Can You Catch A Cold?: Untold History & Human Experiments
by Daniel Roytas
- List rank#7
- Price$9.99
- Rating4.9
- Reviews253
-
Coming Apocalypse
by Vernon Coleman
- List rank#8
- Price$2.99
- Rating4.4
- Reviews2,174
-
Herbal Antivirals: Heal Yourself Faster, Cheaper and Safer (Your A-Z Guide to Choosing, Preparing and Using the Most Effective Natural Antiviral Herbs)
by Mary Jones
- List rank#9
- Price$3.99
- Rating4.6
- Reviews384
-
Viruses Made Easy: An Easy To Read Guide On The Foundations Of Viruses and Virology
by Jon Adams
- List rank#10
- Price$4.99
- Rating3.4
- Reviews15
FAQ
Is Viral a good niche for Amazon KDP?
Its KDPTop opportunity score is 20/100, which makes it highly competitive. The median best seller has 4 reviews and sells for $5.99.
How many reviews do you need to rank in Viral?
The median best seller has 4 reviews, and 87% of them have fewer than 100.
What do Viral best sellers cost?
The median price is $5.99; half of the best sellers are priced between $3.62 and $9.98.
Can new books break into Viral?
9% of the current best sellers were released in the last 90 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.