What are small animals such as insects and rodents that spread disease?

Many animals can carry diseases, however rodents are rarely the real culprit when it comes to diseases that affect humans. More often it is insects, typically the ones that feed off of blood such as fleas, ticks, mosquitos and bedbugs, who by feeding off of blood can tranfer diseases present in the blood of previous hosts into the blood of their current food source. As well, certain flies can carry large amounts of dangerous bacteria on their bodies.