Disease carriers are organisms that can transmit pathogens, such as bacteria or viruses, from one host to another. These carriers often do not show symptoms of the disease themselves, making them difficult to identify. Common examples include mosquitoes, which can carry diseases like malaria and Zika virus, and ticks, which can transmit Lyme disease. Carriers play a crucial role in the spread of infectious diseases, affecting both human and animal populations. Understanding how these carriers operate helps in developing prevention strategies, such as vaccines and public health measures, to reduce the risk of outbreaks and protect communities.