SYDNEY, Australia — An Australian company has recalled its frozen berry products after a hepatitis A outbreak linked to poor hygiene and water supplies in a Chinese packaging plant.

The Australian authorities were investigating on Monday after five people became sick after eating Patties Foods berries, which were grown in Chile and China and packaged at the Chinese factory.

There has long been concern about food safety in China, where pollution from rapid industrialization has exacted a heavy toll on soil and water. Poor hygiene in production and packaging plants has also been a problem.

Contamination scandals that led to deaths and serious illnesses have increased the popularity in China of imports of European infant formula, New Zealand milk and Japanese rice.