Researchers looked at early data from COVID-19 patients in the United States between February and March 2020. They wanted to see if having certain pre-existing health conditions was linked to getting sicker from the virus. The conditions they looked at included diabetes, heart disease, chronic lung disease, and smoking.
The data suggested that patients with these conditions appeared to be at higher risk for severe COVID-19. Severe disease was defined as needing to be hospitalized or admitted to an intensive care unit (ICU). The study compared these patients to people without the listed conditions.
It is very important to understand this is a preliminary report based on early, observational data. The researchers did not report specific numbers on how much the risk increased. This means we cannot say for sure that these conditions cause worse outcomes—only that an association was seen in this early look. The findings are a useful early signal for doctors and public health officials, but more complete research is needed to understand the true risks.