Tularemia as a Mosquito-Borne Disease

Area of Science:

• Microbiology and Infectious Diseases
• Vector-borne Diseases
• Epidemiology

Background:

• Francisella tularensis (Ft) causes tularemia, a disease prevalent in the Northern Hemisphere.
• Two subspecies, Ft subsp. tularensis (Ftt) and Ft subsp. holarctica (Fth), are the primary agents of tularemia.
• While ticks are known vectors, mosquitoes are implicated as major vectors of Fth in Scandinavia.

Purpose of the Study:

• To review existing research and epidemiological data on the link between tularemia and mosquitoes in Scandinavia.
• To identify knowledge gaps concerning the interaction between mosquitoes and Francisella tularensis.

Main Methods:

• Literature review of scientific research.
• Analysis of epidemiological data concerning tularemia outbreaks in Scandinavia.
• Synthesis of information on known and potential mosquito-vectoring mechanisms.

Main Results:

• Mosquitoes are identified as the primary vectors for Ft subsp. holarctica (Fth) in Scandinavian tularemia outbreaks.
• Large-scale outbreaks often coincide with warmer seasons, suggesting a role for seasonal vector activity.
• The precise biological mechanisms by which mosquitoes transmit Fth remain largely unelucidated.

Conclusions:

• Mosquitoes play a critical role in the epidemiology of tularemia in Scandinavia.
• Understanding the vector competence and transmission dynamics of mosquitoes for Fth is crucial for public health.
• Further investigation is warranted to elucidate the mechanisms of Fth transmission by mosquitoes.