Yes, but these are very exceptional to rare cases. The standard second course of chickenpox is very rare, but it can occur with enormously weakened immunity. The reason for repeated occurrence may be that the person in question has become infected with a specific mutation of the virus or just believes that he has overcome chickenpox in the past. It could easily have been another infectious disease, which is why the body has not created antibodies. Usually, the second infection with chickenpox is called shingles, which is caused by the reactivation of the varicella zoster virus.\r