Which pest has the least ability to spread disease?

Ants generally have the least ability to spread disease compared to the other pests listed. While certain species of ants can carry pathogens on their bodies, they are not typically considered significant vectors for foodborne illnesses.

In contrast, cockroaches and rodents are known carriers of various bacteria, viruses, and parasites, often contaminating food and surfaces as they scavenge for food. Flies are also notorious for spreading diseases because they can pick up pathogens from decomposing matter or fecal material and transfer them to food.

Therefore, while all pests can pose some level of risk, ants’ limited role as disease carriers makes them the least concerning in terms of disease transmission compared to cockroaches, rodents, and flies.