The department confirmed that the northern province of Ninh Binh had been declared bird flu free.

Three provinces are still plagued by bird flu – Dien Bien in the north, Quang Binh in the center and Dong Thap in the Mekong Delta region.

A province is declared bird flu-free after it goes 21 consecutive days without a new case, according to the ministry.

Last week, the blue-ear disease, known in medical parlance as Porcine Reproductive and Respiratory Syndrome (PRRS), was reported in Danang city, Quang Ngai, Quang Nam, and Thua Thien-Hue provinces.

But  the department said Danang and Quang Ngai had seen no new blue ear infections in the last few days.

Meanwhile, in Quang Nam province, the number of infected pigs fell from 29,000 to some 7,000 as of Sunday.

Local animal health centers are strengthening quarantines, sterilizing infected areas and culling all infected pigs.

However, some 32 pigs in the Mekong Delta’s Long An province showed signs of the disease yesterday.

Ongoing diagnostic work on the pigs has yet to yield conclusive results.

PRRS in pigs is caused by the Lelstad virus, which causes ears to turn blue, appetite loss, high fever, miscarriage, premature delivery, coughing, respiratory problems, and death in extreme cases.

Reported by Thanh Nien staff – Translated by Tuong Nhi