Avian influenza (4,3)
I believe the answer is:
bird flu
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">avian influenza</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that avian influenza can be written as bird flu)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bird flu that I've seen before include "Avian virus that can spread to humans" , "viral disease" , "Avian disease contractible by humans" , "Poultry virus that can spread to humans" .)