The Scot has struggled with the infection since the Australian Open, which ended Feb. 1. The fourth-ranked men’s player told reporters during a tournament in Rotterdam two weeks ago he’d been on antibiotics. He was given more antibiotics last night by the tournament doctor following his straight-sets win over Arnaud Clement of France in the second round.

“That didn’t help too much,” Murray said in a televised interview. “Nothing works so far. I am going to take a few days off and may go home tomorrow.”

He was supposed to play Richard Gasquet, another Frenchman, in the next round. Murray is the fourth top-10 player to withdraw from the event. Australian Open champion Rafael Nadal isn’t in Dubai because of a knee injury while second-ranked Roger Federer cited a back injury for his absence.

Former U.S. Open champion Andy Roddick also withdrew, partly in protest at the treatment of Israeli player Shahar Peer, who was refused a visa to play in last week’s women’s event by the United Arab Emirates.