Which type of vector transmits pathogens without the pathogen developing inside it?

A mechanical vector is indeed the type of vector that transmits pathogens without the pathogen developing inside it. These vectors are typically involved in the physical transfer of pathogens from one host to another, commonly through their body surfaces. An example of a mechanical vector is a fly that lands on feces contaminated with pathogens and then transmits those pathogens to food or other surfaces when it lands elsewhere.

Unlike biological vectors, where the pathogen undergoes replication or development within the vector's body, mechanical vectors simply carry the pathogen on their bodies or mouthparts. This distinction is crucial in understanding how various vectors contribute to the spread of diseases. Environmental vectors and active vectors do not refer to established categories in vector biology, which is why they do not accurately apply to the context of this question.