Health authorities are investigating imported frozen berries after four people fell ill with the vomiting virus hepatitis A.
Peter Thomson, of the Ministry for Primary Industries, said "Our investigations to date have not revealed a specific cause, but there is an association with consuming frozen berries.
"Recent outbreaks in other countries also suggest this link."
In February, the ministry said it was monitoring frozen berry imports after a recall of frozen mixed berries in Australia prompted by cases of hepatitis A.
They are not mentioning brands. Does this mean it is not brand specific or they prefer not to ssy because of weak evidence?