Reddit reviews All Prime Watermelon Slicer Large Green – How to Use Instructions in Photo – Also Includes an Orange Peeler – Watermelon Cutter - Stainless Steel Blades – Comfort Handle –Melon Slicer

In his case, nearly yes. Most cases of salmonella are from cross contamination. The same knife is used to cut hundreds of melons, when only one of them is contaminated. If you cut them yourself, the chance of contamination is greatly reduced. Once cut, the salmonella will multiply, so consuming them immediately is far less likely to make you sick, though technically all it takes is one.

Note, the Mexican government takes this problem so seriously, no cases of salmonella were reported in the US from Mexican cantaloupe in the 9 years before a 2014 study. See page 9

The problem with melons is on the outside. Cutting them should only be done with a tool that minimizes the cuts through the fruit from the outside, like this for watermelon. . There are similar tools for cantaloupe.