[Researchers] analyzed the electronic medical records of more than 74,700 people from the US, UK, Italy, Germany, Israel and Singapore, who tested positive for COVID-19 ... those who didn't get flu shots were up to 20% more likely to be admitted to the ICU; up to 58% more likely to visit the emergency room; up to 45% more likely to develop sepsis; up to 58% more likely to have a stroke; and 40% more likely to develop deep vein thrombosis, compared with those vaccinated against the flu.