patties food insists testing has n't found link between their berries & hep a .
there was a national hepatitis a outbreak in january which resulted in 34 people in six states contracting the virus .
all 34 people who contacted hep a had consumed the china-grown berries .
the 1 kg product remains off supermarket shelves until further notice .
the company says there was no systemic error but confirm they are considering alternative supply sources .