
der Wirt
innkeeper
A man who owns or runs a pub, inn, or restaurant.
Der Wirt brachte uns persönlich die Speisekarte.
The innkeeper personally brought us the menu.
innkeeper / host
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innkeeper
A man who owns or runs a pub, inn, or restaurant.
Der Wirt brachte uns persönlich die Speisekarte.
The innkeeper personally brought us the menu.

host
In biology, a living organism that allows another organism (a parasite or symbiont) to live in or on it and provides it with nourishment.
Der Mensch ist der einzige bekannte Wirt für dieses spezielle Virus.
Humans are the only known host for this particular virus.
The word 'Wirt' is related to the verb 'bewirten' (to serve guests food and drink) and the noun 'Wirtschaft' (another word for a pub or inn).
Wir wurden vom Wirt freundlich bewirtet.
We were served warmly by the innkeeper.
The term 'Wirt' for the operator of a pub or inn is traditional and especially common in southern Germany, Austria, and Switzerland. It often has a cozy, personal feel.
Der Wirt kennt alle seine Stammgäste mit Namen.
The innkeeper knows all his regular customers by name.
You can recognize the biological meaning from the context. If 'Parasiten' (parasites), 'Viren' (viruses), 'Bakterien' (bacteria), or 'Organismen' (organisms) are being discussed, the biological host is meant. In the context of 'Gaststätte' (pub/restaurant), 'Bier' (beer), or 'Essen' (food), it refers to the restaurant or pub owner.
Mücken können als Wirt für verschiedene Krankheitserreger dienen.
Mosquitoes can serve as hosts for various pathogens.
sponsor / carrier
For a pathogen, Träger highlights its presence and possible transmission, often without symptoms in the carrier. Wirt places more emphasis on the living being in which another organism lives and from which it receives nourishment. Choose “Träger” for the carrier and “Wirt” for the living and feeding relationship.

Das Tier ist der Wirt des Parasiten, der in seinem Körper lebt und von ihm ernährt wird.
The animal is the parasite’s host; the parasite lives in its body and is nourished by it.
Obwohl sie gesund wirkte, war sie eine Trägerin des Erregers und konnte ihn weitergeben.
Although she appeared healthy, she was a carrier of the pathogen and could pass it on.