1 mile run and 3.5 mile walk

Well what was supposed to be a 9.44 mile run turned into a 1 mile run and a 3.5 mile walk. I have had this soar throat and a nasty cough for about a day or two and when I was running it felt like my lungs were on fire. Now as I sit here I am hacking up a lung! uhg I should have known. Oh well at least I got my cardio in :)