The outbreak has followed the All Blacks on their end of year tour with four All Blacks, one by one, taken down in as many weeks.
Jack Goodhue, Rieko Ioane and Ardie Savea all contracted the infectious viral disease, and now lock Luke Romano.
“Luke Romano's in semi-quarantine, because he's got them as well, so I think that might be four cases,” says Coach Steve Hansen. “And all of them have been vaccinated.”
It follows a huge spike in mumps cases in Auckland this year - now nearing 900 - numbers not seen in decades.