Health precaution a rare condition's brought about? (6,9)
'health precaution' is the definition.
The definition suggests a singular noun which matches the answer.
'a rare condition's brought about?' is the wordplay.
'brought about?' indicates anagramming the letters (I've seen 'brought about' mean this).
'arareconditions' is an anagram of 'CORDON SANITAIRE'.
Can you help me to learn more?
(Another definition for cordon sanitaire that I've seen is "barrier to infection".)