The 16-year-old singer is often mobbed by teenage girls and has claimed that this reaction will only spread.
He told Bang Showbiz: "They may be crazy but they're the ones that help me to be here and who put me where I am in the first place. I never worry about getting more fans as it spreads.
"And, by the way, there is no cure for 'Bieber Fever'!"
Bieber also revealed that his fans have gone to extraordinary lengths to meet him.
He added: "I've done things like signed a cereal box before. But the weirdest thing that's been done to meet me? Well some girls have got tattoos of my name done. One mum has a tattoo of a radio DJ on her back, which she had done in order to meet me.
"The radio station had a contest and if anyone got the guy from the radio station's face tattooed on their back, they could meet me, and that was the contest, and she did it. It was pretty weird!"