I'm going to work with a highly contagious cold
Why would you go to work when you are not feeling well?
I need to work no one else can do my job.
It is wrong to go to work and infect other people. You should take the day off or work from home.
It's too little to stay in bed and I can handle myself .
You are probably going to spread your germs and get other people sick. You really need to stay home if you have a cold.