Vectors play a significant role in toxicology by acting as carriers for toxic agents. For example, mosquitoes can carry and spread the West Nile Virus, which can lead to severe neurological diseases in humans. Similarly, ticks can transmit Lyme disease, which is caused by the bacterium Borrelia burgdorferi. These vectors can introduce toxins into human and animal populations, thereby influencing the spread and impact of toxicological threats.