Irregular blood clotting has been singled out as one of the most “startling and, unfortunately, devastating complications” of coronavirus, according to Gary Gibbons, MD, director of NIH’s Heart, Lung, and Blood Institute. It’s also among the deadliest: A July 2020 study published in the journal Radiology reveals that 38 percent of study subjects with coronavirus who experienced blood clots in their legs died. And for insight into potential lifesaving treatments, This Could Help the “Sickest of the Sick” Coronavirus Patients, Doctors Say.ae0fcc31ae342fd3a1346ebb1f342fcb While there are numerous dermatological symptoms of coronavirus that don’t necessarily predict extreme outcomes—from a mouth rash to a measles-like rash on the skin—a web-like rash could mean serious trouble. Retiform purpura was found only in coronavirus patients who were critically ill in a study published in the Journal of the American Academy of Dermatology (JAAD), and the condition was associated with death in 27 percent of the study’s coronavirus patients. And for more up-to-date information, sign up for our daily newsletter. Diabetes has been identified as a predictive factor for serious complications in many coronavirus cases—according to an April 2020 study published in the Journal of Infection, coronavirus patients with preexisting diabetes were nearly four times more likely to die than those without the condition. However, even among patients without diabetes, high blood sugar was a significant predictor of mortality. An April 2020 study published in the Journal of Infection found that coronavirus patients without diabetes who had significantly elevated blood sugar, or hyperglycemia, had nearly double the risk of death compared to other COVID patients. And for more insight into the connection between chronic illness and COVID, Coronavirus Is Killing People with This Common Condition in a Week. Fever is a commonly reported symptom, even in mild coronavirus cases. However, when temperatures elevate past a certain point, they’re more likely to become fatal. A June 2020 study published in Critical Care reveals that coronavirus patients with a maximum body temperature of 104 degrees Fahrenheit had as much as a 42 percent risk of death. And if you’re wondering how long coronavirus is contagious for, You Can Catch COVID From Someone This Many Days After Their Symptoms Begin.