Chipotle is in damage control mode amidst yet another outbreak of illnesses linked to the restaurant's food this week. The chain's co-CEO and founder, Steve Ells, apologized to the public during a Today Show appearance on Thursday, promising that the strict new food-safety rules the company is planning will make it "the safest place to eat." The apology comes after as many as 141 Boston College students and other locals who ate at Chipotle locations near the campus reportedly fell ill this week with symptoms of norovirus, a violent stomach sickness most often spread through tainted foods. Two months earlier, the restaurant was linked to an outbreak of E.coli that sickened dozens of people across nine states. Investors cheered the apology on Thursday, sending shares of the ailing stock up more than 5 percent after a fraught couple of months that eroded a significant chunk of the chain's market value.