The number of victims of the E. coli outbreak linked to McDonald's Quarter Pounder hamburgers has climbed, the Centers for Disease Control and Prevention (CDC) reported Friday.

The agency said in an update that 75 people have been infected with the E. coli O157:H7 strain across 13 states as of Thursday, and 22 have been hospitalized.

When the CDC first announced the outbreak on Tuesday, there were 49 cases of people becoming sick, resulting in 10 hospitalizations and one death.

This is a developing story, please check back for updates.