McDonald's ( MCD ) shares hit an intraday record high Friday, continuing their unsteady climb since an E. coli outbreak last October.

McDonald's shares rose about 4% in recent trading to $323.16, surpassing the previous intraday high of $317.90 set on Oct. 21, the day before the Centers for Disease Control and Prevention (CDC) said dozens of cases of E. coli infection had been reported across several states.

Shares of the fast-food giant fell to as low as $276.53 on Jan. 16, but have risen about 16% since. They climbed nearly 5% in a single session on Feb. 10, when the company reported global comparable sales returned to growth in the fourth quarter .

McDonald's was the top gainer in the Dow Jones Industrial Average early Friday afternoon.

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