Cake mix linked to E. coli outbreak, CDC says. As of last week, at least 16 people had been infected with the O121 strain of E. coli since February, according to the Centers for Disease Control and Prevention. As of last week, at least 16 people had been infected with the O121 strain of E. coli since February, according to the Centers for Disease Control and Prevention. They ranged in age from 2 to 73, and were all female. Seven of the people infected with the bacteria strain were hospitalized, but no deaths have been reported, according to the CDC. However, the actual number of people sickened by the outbreak is likely much higher than what’s been reported so far, officials said. Check out the link to read more about this.