Multi-select problem: How does the next paragraph end?

How to recognize salmonella poisoning (salmonellosis ) 
Take note of nausea and vomiting. 
Salmonella poisoning's number one symptom is often nausea and vomiting. Because people often contract salmonella poisoning as a result of eating something contaminated with feces, your body's natural response is to void the contents of your stomach.

Choose your answer from:
(I) Although nausea is the most common symptom of salmonella poisoning, there are a number of other ailments that may cause the same symptom. If you are vomiting, you will need to rehydrate, but avoid drinking water immediately after vomiting.
(II) This often occurs when your mouth or throat is shut so food remains trapped. To help determine the actual cause of your nausea, look for : Clenched jaws, clenching and swallowing.
(III) Due to this, as your body takes a while to digest the poisonous contents, your gut releases a lot of gas. This reaction is known as nausea and vomiting.
(IV) However, there are several deductions that you can take into account : Improper urinating. This is one of the most common and serious stomach ulcers.
(I)