Some people who are affected by MERS also had gastrointestinal symptoms including diarrhea and nausea/vomiting. For many people with MERS, more severe complications followed, such as pneumonia and kidney failure. About 3-4 out of every 10 patients reported with MERS have died. Most of the people who died had an underlying medical condition. Some infected people had mild symptoms (such as cold-like symptoms) or no symptoms at all; they recovered. Based on what researchers know so far, people with pre-existing medical conditions (also called comorbidities) may be more likely to become infected with MERS-CoV, or have a severe case. Pre-exisiting conditions from reported cases for which current information have included diabetes; cancer; and chronic lung, heart, kidney disease. Individuals with weakened immune systems are also at higher risk of getting MERS or having a severe case.