Nomen

der Impfstoff

vaccine

Der neue Impfstoff ist sehr wirksam.

The new vaccine is very effective.

Viele Menschen warten auf den Impfstoff.

Many people are waiting for the vaccine.

((the vaccine)) the vaccine The vaccine protects against the disease.

das Vakzin (vaccine)

Composed of 'impfen' (to vaccinate/inoculate) and 'Stoff' (substance, material). Literally 'vaccination substance'.

Think of it as the 'stuff' you get for an 'impf' (vaccination). The components make the meaning clear.

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