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According to wikipedia and Human Parasitology By Burton Jerome Bogitsh, Clint Earl Carter, Thomas N. Oeltmann

Phoresis: In this type of symbiotic relationship, the phoront, usually the smaller organism, is mechanically carried by the other,usually larger organism the host.

So can the host acting as a carrier be called a mechanical vector?

On searching google.books I found some books mentioning:

Like Clinical parasitology

Hosts that transmit parasites to man are vectors. Those that are essential in the life cycle are biologic vectors; those that are not essential are phoretic or mechanical vectors.

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A mechanical vector just as biological vector transfers a parasite to its obligatory host but carrying it on the surface of its body while the host in phoresis is not necessarily carrying a phoront to an obligatory host (for parasitic interaction).

A parasite-mechanical vector relationship is possibly a kind of phoresis.

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