While many who have the virus may have very mild symptoms, some experience symptoms that are more severe. Symptoms include fever, fatigue, cough, and aches. The illness can progress to shortness of breath, pneumonia and related complications. Symptoms may also include nausea with vomiting and diarrhea. Those who are more likely to experience more severe symptoms include older individuals and those with underlying health conditions. At this point, children do not seem to be particularly vulnerable to severe illness. As more data are collected on the outbreak, more information will be known as to who is most affected.