noun
BAD : I think I have caught a flu.
GOOD : I think I have caught (the) flu.
◆◆◆
flu or the flu (NOT a flu ): 'They are both off work with flu.' 'Even our doctor is down with the flu.'
noun
BAD : I think I have caught a flu.
GOOD : I think I have caught (the) flu.
◆◆◆
flu or the flu (NOT a flu ): 'They are both off work with flu.' 'Even our doctor is down with the flu.'
Longman Common Errors English vocabulary. Английский словарь распространенных ошибок Longman. 2012