The best replacement for ccu is icu.

The best alternatives to ccu are rated as following:
★★★★★  icu
★★★  cvicu
★  winthrop
★  ceu
  pcu
  icu worse

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No companions for ccu have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of ccu in all years. Click on graph for more.
ccu
icu
cvicu