The most notable disease carried by rats was the plague, that decimated London and was related to the black rat,these days this disease isn’t a problem within the UK. but there area unit 3 main diseases related to rat infestations found within the UK: –

• Salmonella (food poisoning)
• Weils disease (also called Leptospirosis) and
• Trichinosis

All these diseases are often fatal in severe cases