Polymicrobial Nature of Tick-Borne Diseases

Area of Science:

• Medical Entomology
• Infectious Diseases
• Molecular Biology

Background:

• Tick-borne diseases are a growing public health concern, with increased incidence and geographic spread.
• Climate change and the expansion of tick vectors like *Amblyomma americanum* contribute to the dynamic situation.
• Polymicrobial infections in ticks, particularly *Ixodes scapularis*, can lead to complex diagnostics and increased disease severity.

Purpose of the Study:

• To assess the prevalence of key tick-borne microbes in Suffolk County, New York.
• To document changes in tick-borne pathogen distribution and identify co-infections.
• To understand the impact of expanding tick populations on disease transmission.

Main Methods:

• Molecular biology techniques were used for pathogen detection.
• Analysis focused on 12 microbes (9 pathogens, 3 symbionts) in three tick species.
• Ticks were collected from Suffolk County, New York.

Main Results:

• *Ixodes scapularis* ticks showed high infection rates (63%), with *Borrelia burgdorferi* (57%) being the most prevalent pathogen.
• *Babesia microti*, *Anaplasma phagocytophilum*, *Borrelia miyamotoi*, and Powassan virus were also detected.
• Polymicrobial infections were found in 22% of *I. scapularis*, with common co-infections including *B. burgdorferi* and *B. microti* (9%).
• *Ehrlichia* species were detected in *A. americanum* ticks (4%), and *Rickettsia* species constituted the largest prokaryotic biomass.

Conclusions:

• High rates of polymicrobial infections in ticks highlight the need for further research into pathogen-vector-host interactions.
• The findings underscore the complex and evolving landscape of tick-borne diseases.
• Understanding co-infections is crucial for accurate diagnosis and effective management of tick-borne illnesses.