Paralyzing Flu

Potentionally Fatal?:
Depends upon the immune system

Causes:
It's a mutated version of the influenza virus, coming into existence after Earth was nuked. It is generally spread through water systems, though it does not affect aquatic animals, it takes a rather hefty process to remove the virus from any aquatic based meal originating from Europe.

Basically, water and fish. It can be spread by coughing and such too.

Symptons:
Fever, coughing, sore throat, swollen lymph nodes, chills, fatigue, sweating, wheezing, muscle weakness, feeling faint, headache, nausea and of course, paralysis.

Known cures:
There's an extremely hostile bee on a planet by the name of Imead, residing on an island in the Astil ocean. Their honey appears to cure the initial symptons, including paralysis if provided within 5-10 days of symptoms occuring.

IRL References: Polioundefined, pneumoniaundefined and influenzaundefined