The recent E.Coli outbreak at McDonald’s has many in the state of Texas worried. But how does one know if they’ve been infected? A Houston doctor has the answer we need. As reported by CNBC, the outbreak began after the the bacteria was discovered in onions served at the restaurant. At the time of writing, there are 75 cases documented, with 13 states in the nation involved. Thankfully, the CDC reports that due to the actions of McDonald’s and Taylor Farms, who provided the onions, risk for many in the nation getting infected has shrunk.