SACRAMENTO—Salmonella fears have prompted a Ripon, Calif.-based company to issue a recall of its organic brown eggs.

The company, den Dulk Poultry Farms, says its eggs were sold at Costco, Safeway and Pack n' Save stores throughout Northern California, the Central Valley and western Nevada.

The company said Friday that no illnesses had been reported.

The eggs were sold at Costco stores as Kirkland Organic Brown Eggs in 18-count cartons with the following expiration and plant codes: April 1 062, 35 P1776 and April 8 069, 35 P1776.

They were sold at Safeway and Pack n' Save stores as O Organic Grade A Large Brown Eggs in 12-count cartons with the following expiration and plant codes: April 1 062, 35 P1776.

Customers who bought the eggs are urged to return them to the store where they were purchased. Consumers with questions should call den Dulk at 209-599-4269.

Salmonella can cause serious and sometimes fatal infections in young children, frail or elderly people, and others with weakened immune systems.