It comes as the health system is under pressure due to Covid and other winter ailments.
Three Auckland suburbs see median values fall by more than $90,000.
Dr Bloomfield outlined the "worst-case scenario" that could see Kiwis face a more severe and more transmissible variant - that also evaded existing immunity.
University of Auckland's Dr Collin Tukuitonga says short hours at testing sites is likely to hit those already disadvantaged hardest.
Striking workers includes contact tracers and lab technicians who process Covid-19 tests.