What are the living organisms that carry the infecting agents from one person to another known as?

Vectors are organisms that carry a disease-causing pathogen and transmit them to healthy individuals.

Examples of vectors include mosquitoes, houseflies, sandflies, tsetse flies, mites, cockroaches, rats, etc.

Diseases like malaria, dengue, cholera, filariasis, plague, etc are examples of vector-borne diseases.