you cant get it twice BUT you can have it and just not properly get rid of it but feel fine, then, if you get really run down, it can come back

Doctor's notes don't solve everything, especially if you're in an 'at will employment' state and your boss is a douchebag. Speaking from personal experience here. I had a grapefruit sized cyst that was pressing against a bundle of nerves in my spine, causing huge amounts of pain and inability to walk/drive safely because the pressure was making me have leg spasms. Gave my boss two doctor's notes and explained that I could work light duty till the surgery and that I'd be back to working at full capability just a week after surgery, and that I'd found people willing to cover my shifts while I was out, and he still fired me on the spot. Nothing I could do because Missouri is an 'at will employment' state, meaning they can fire you and not have to give an official reason. Unless the OP's boss wrote it out that he was firing OP for the illness, there's not much OP can do. FYL OP, your boss is a dick.

Mono sucks, but it doesn't suck so badly that you should have stayed home from work.

you get mono when someone elses saliva enters your mouth. hence the nickname, the kissing disease. you can alo get it by sharing food.

man, i wish ppl who make up FMLs would at least be knowledgeable about labour laws. they can't and wouldn't fire you or something so trivial. Presumably you have a doctor's note which would prove that you have mono.

Infectious mononucleosis/glandular fever is caused by the Epstein-Barr virus which is one of the Human Herpesviruses. It infects the B cells of your immune system and can cause cancer. 

"man, i wish ppl who make up FMLs would at least be knowledgeable about labour laws. they can't and wouldn't fire you or something so trivial." -#89 I'm glad that wherever you live, employers can't fire employees for being sick. However, in many states in the US, employers can fire employees for absolutely no reason (other than those protected by law, i.e. race, religion, etc), and employees can quit at any time, without giving reason or notice. Employees sign a paper acknowledging this fact when they accept a new job. So, if your employer doesn't like the way you dress, the way you talk, who you date, etc, they can fire you, and you have no recourse of action. Also, as many have pointed out, mono can reoccur, and it can be very mild to very severe. I was sick with it for over a month, could hardly breathe and couldn't swallow my own saliva due to extreme swelling in my throat. My fever was nearly 105 degrees at one point, and I got a terrible eye infection as well due to my compromised immune system. My sister got it, missed a couple days of school, and was back to normal. Please don't be so quick to cry "fake" when you don't know what you're talking about...

Holy crap the you totally deserve it button has 666 votes, wierd, gonna b 667!

I thought you could only get mono once?

I got mono when I was a teenager. I had it flare up on me twice more the same year I got it. Ironically enough, I had a lot of stress as a teenager and I wasn't exactly fit as a fiddle either. It's a virus that (much like a cold sore, a lot like it actually as cold sores are herpes, much like the Epstien Barr Virus that causes mono) can flare up over a person's life. Hell the first time I got it, it developed into anemia. I almost died (metaphorically) when I found out I had it again a few months later, but the doctor explained it to me. Now I just make sure I'm healthy as I can be. But it sucks to be you that your employer axed you for it, despite being out of your control. You should look into your local labor organization about a possible wrongful dismissal on ground of medical condition.