What combos are available and what are their effects?

I have noticed on multiple playthroughs that evolving certain symptoms can result in a combination symptom, as follows:

enter image description here

In this instance, sneezing and diarrhoea are causing "unwanted accidents", which draws additional attention to your plague.

What other symptoms can be combined to create a combo and what the effects of each combo are?

Pictures about "What combos are available and what are their effects?"

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.