
erkrankt
ill
Describing the state of having an illness. It is often used with 'an' to name the specific illness.
Er ist an einer schweren Grippe erkrankt.
He is ill with a severe flu.
ill
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ill
Describing the state of having an illness. It is often used with 'an' to name the specific illness.
Er ist an einer schweren Grippe erkrankt.
He is ill with a severe flu.
The word 'erkrankt' (ill) is the past participle form of the verb 'erkranken' (to fall ill). The prefix 'er-' here describes the beginning of a state, meaning the transition from a healthy to an ill state.
Leider ist mein Kollege plötzlich erkrankt.
Unfortunately, my colleague suddenly fell ill.
To name the specific illness, use the preposition 'an' followed by the dative. This structure is very fixed and important for correct usage.
Viele Menschen sind an der Grippe erkrankt.
Many people have fallen ill with the flu.
'Erkrankt' (ill) is usually used as a predicative adjective with the verb 'sein' (to be). The construction 'jemand ist erkrankt' (someone is ill) describes the state of being sick.
Der Firmenchef ist seit letzter Woche erkrankt.
The company director has been ill since last week.
sick
Krank and erkrankt both describe a person who has an illness. Krank generally refers to the condition, while erkrankt places more emphasis on the illness having developed and is especially common in formal sentences with “an.” Use krank in everyday situations and erkrankt for a more precise, formal statement.

Mia ist an einer Lungenentzündung erkrankt und bleibt deshalb zu Hause.
Mia has fallen ill with pneumonia and is staying home.
Mia ist seit Montag krank und bleibt deshalb zu Hause.
Mia has been sick since Monday, so she is staying home.