A distraught Elton John was forced to call off his first - and, as it turned out, only - Auckland concert last week midway through the performance.

He told the crowd that he was suffering with a form of "walking pneumonia" and had lost his voice. 

The singer now won't be returning to the country until January next year, in which he hopes to deliver his final two concerts in the country. 

Saturday Morning's health expert Dr Bryn joined Jack Tame to discuss what "walking pneumonia" is exactly.

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