List of Bacterial Diseases transmitted by insects

Last updated on May 13th, 2021

Insects act as a vector and are responsible for the transmission of various infectious diseases from the reservoirs to humans. In this blog post, you can find information regarding bacterial diseases transmitted by insects. Fleas, ticks, and lice are common insects.
Ticks alone are responsible for the transmission of Lyme disease, Rocky Mountain spotted fever, ehrlichiosis, relapsing fever, and tularemia.


Plague is caused by the bacterium Yersinia pestis. Rat fleas are responsible for the transmission from the reservoir (eg. rats, prairie dogs) to humans.


Tularemia is an infectious disease caused by Francisella tularensis. F. tularensis is a parasite of wild animals. Ticks (Dermacentor) transmits this pathogen from animals such as rabbits to humans.

Lyme disease

Lyme disease is caused by a spirochetes Borrelia burgdorferi. It is transmitted from mice to humans by ticks (Ixodes).

Relapsing Fever

Borrelia recurrentis is a causative agent of relapsing fever. It is transmitted from infected persons to susceptible ones by lice.

Rocky Mountain Spotted Fever

This disease is caused by Rickettsia rickettsii. The bite of ticks (Dermacentor) transmits this disease from dogs, rodents to humans. Dermacentor ticks also act as a reservoir.


Ehrlichiosis disease is caused by a Rickettsias, Ehrlichia chafeensis.  The reservoir of this bacterium is dogs. Ticks (Dermacentor) is the insect vector responsible for disease transmission.

About Acharya Tankeshwar 474 Articles
Hello, thank you for visiting my blog. I am Tankeshwar Acharya. Blogging is my passion. I am working as an Asst. Professor and Microbiologist at Department of Microbiology and Immunology, Patan Academy of Health Sciences, Nepal. If you want me to write about any posts that you found confusing/difficult, please mention in the comments below.