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Several days ago I learnt my friend was sick/ill/had caught a cold; if I want to know whether he has restored his health, how should I phrase the question?

Thank you.
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eg Are you OK now?
eg Are you better now?

Clive
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The use of 'now' in Clive's suggestions imply that you know your friend has not been well. The word 'better' in the second suggestion makes it obvious.
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Comments  
Thank you. But if one day I see him, he wouldn't remember I know him to have caught a cold; how should I phrase the question to make him know I am talking about his cold?
 fivejedjon's reply was promoted to an answer.
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How do I ask to my friend about his fever?