Illness

With the infamous guinea pig disease a thing of Sims 1 past, Sims can now catch a few different diseases, each with there own symptom and method of catching- they're contagious, too.

Morning sickness
Not strictly an illness as it can't be cured and only lasts one day. The first in-game sign that a sim is pregnant. Throughout the day the sim in question will run to the toilet to throw up.

Food poisoning
There is a 5% chance any time a sim eats spoiled or burnt food that the sim will get food poisoning. Sims will suffer nausia (a sharp drop in confort) diarheoa(???- a sharp drop in bladder) and will run to the toilet at regular intervals.

Cold
A 5% chance when standing next to or near roaches or any time a sim goes to work, school ect. Pretty obviously sims will suffer from coughing and sneezing fits cauing a drop in comfort.

Flu
If the cold is not cured in three days it can become the flu. The flu has all the symptons of a cold with sharp drops in fun and energy as well.

Mysterious disease
Can be infected by when using the biotech station. The symptons are random and can be any of the above.

Curing
The best cure for all illnesses is rest. Keep the ill sim away from healthy sims, making them relax for the preiod of their illness until a message appears saying they are cured.

Passing it on
Not all illnesses are contagious and when they are they are contagious at different rates. As food poisoning is an infection from only one source and moruning sickness only affects pregnant sims these are not contagious. The mysterious disease is more contagious than the flu and the flu is more contagious than the cold.