Disease vectors are organisms that transmit pathogens, such as bacteria and viruses, from one host to another. Common examples include mosquitoes, ticks, and fleas. These vectors can carry diseases like malaria, Lyme disease, and plague, affecting both humans and animals. Vectors typically acquire pathogens when they feed on infected hosts. Once infected, they can spread the disease through bites or contact with bodily fluids. Understanding disease vectors is crucial for controlling outbreaks and protecting public health, as reducing their populations can significantly lower the risk of disease transmission.