Brazil-JBS-Swift shares tumble 12% in the wake of swine flu panic.

Brazilian meatpacker JBS would be the most likely affected of meat suppliers, she wrote, "because almost 12% of its sales are U.S.-domestic market pork sales," through Swift Foods Co., which it acquired in 2007.

JBS shares tumbled 12%, their biggest percentage loss since Oct. 9.

Itaú expects rivals Sadia (SDA:Sadia S A) and Perdigão (PDA:perdigao s a sponsored adr"to suffer little because we do not expect industrialized pork volumes in Brazil (ham and sausages, among others) to drop as a consequence, especially if the country is not infected."

Shares of Sadia rose 7.8% but Perdigão finished 1.3% lower.