Please see this previously posted presentation from Prof. Josh Davis about HEV– an excellent overview – tells the Australian part of the story – endemicity in pigs (genotype 3) and local foodborne outbreaks.  2022 reference (WHO) 

The only survey of seroprevalence in the Pacific was published in 2014, referencing data acquired from Kiribati, PNG and Fiji 2003-5 – essential reading.  Overall 15% seroprevalence in PNG, higher in the highlands.  It references some data showing that genotype 3 has been found in pigs in New Caledonia.

As discussed, there will be an unknown morbidity occurring in PNG, especially in pregnant women and it is almost certain that a large zoonotic reservoir exists. Ripe for some proper research and important that local testing is established. 

A recombinant effective vaccine to prevent hepatitis E virus infection has been developed and is licensed in China (Hecolin), but is not yet available elsewhere.