Final answer:
Carriers of pathogenic organisms that transmit diseases from one host to another are called vectors, and common examples include ticks and mosquitoes.
Step-by-step explanation:
Carriers of pathogenic organisms are called vectors. A vector is an organism that carries pathogens from one host to another. Insects such as ticks and mosquitoes are the most common vectors of human diseases. For instance, ticks can transmit the bacteria that cause Lyme disease, while mosquitoes may carry viruses like West Nile virus. These vectors are responsible for the spread of pathogens that cause various diseases, which might result in symptoms such as fever, headache, and tiredness, and might lead to more serious health issues if not treated. It's important to understand that vectors play a significant role in the transmission of infectious diseases.