My running partner Leah and I were both sick as dogs.
Hacking, coughing, blowing our noses for 13 miles. I took a tissue along that I had inhalant decongestant drops on. I held it up to my nose and mouth occasionally for the first 6 miles. After that, we blew our noses for the next 7 miles.
(She didn't actually say that, just trotted along)