NEW YORK - Christina Aguilera, who wraps up her world tour this week, has canceled two shows in Australia because she is ill with the flu.

Doctors confirmed the 26-year-old singer is suffering from a viral upper respiratory tract infection with a high fever and abnormal coughing, said concert promoter The Frontier Touring Company in a statement Monday released through Aguilera's spokeswoman.

Aguilera was put on bed rest for several days, forcing her to miss two shows in Melbourne on Saturday and Monday.

"Unfortunately, I have fallen ill with a bad flu virus," she said in a separate statement. "This is one of the best cities in the world to perform in and I am truly disappointed that I won't be able to share my show with you all."

Several people on her tour have also become ill in Australia, the promoter said.

Aguilera's final two concerts were set for Thursday and Friday in Auckland, New Zealand.