Possible listeria contamination spurred Gills Onions LLC to voluntarily recall 6,000 pounds — an entire day’s production — of diced and slivered red and yellow onions and diced onion-celery mix.

No illnesses had been reported at the time the recall was issued on the evening of July 18, according to Amy Philpott, a company Gills recalls fresh-cut onions, celery in U.S., Canadaspokeswoman.

The Oxnard, Calif., produce company shipped the onions July 2-4 directly to retailers in Canada and in California, Montana, Oklahoma, Oregon, Pennsylvania, Texas, Utah and Washington. There are nine different products in the recall, and they all have July 20 use-by dates.

Gills officials initiated the recall after the Food and Drug Administration notified them that a random sample at retail tested positive for listeria.

As a precautionary move the company is recalling all products processed on the same day and same line as the sample that tested positive; about 5,000 pounds went to U,S. companies and about 1,000 pounds were shipped to Canada.

According to the recall notice, Gills notified all customers who received the recalled products and requested retailers to notify their customers of the recall.

In late May Gills recalled 2,360 pounds of diced red onions in the U.S. and Canada after the Canadian Food Inspection Agency did a random sample and got a positive result for listeria.