Put simply, I don't believe it.
For starters, an actual diagnosis of thypoid means a trip to the hospital, and probably a phone call to the health department. No responsible employer will make you request an extension on your sick leave if you have it. They won't let you back in the building until you have a note from your doctor saying you're healthy. And its not something that goes around once a year like the flu. And its cause, a bacteria, is well known and documented. "Negative energy" whatever that is, has nothing to do with it.
The details of this story don't add up.