The Chinese Health Ministry says the number of people infected with a pig-born disease in the southwestern chinese province of Sichuan has risen to 181, after seven more cases are reported.

The death toll remains at 34.

The government says the disease is believed to be streptococcus suis, a bacteria carried by pigs. So far, the outbreak has infected mostly pig farmers and butchers.

Symptoms include high fever, headaches, dizziness, vomiting and bleeding under the skin. In severe cases, shock and death may occur.

According to the Health Ministry, the latest infections are from nine cities, surrounding townships and villages in the province.

Chinese authorities suspend exports of pork products from Sichuan. Hong Kong, The World Health Organization and other authorities, continue to monitor developments.

Two Hong Kong doctors who have inspected roughly 30 infected patients find no indication of co-infection with other diseases, or evidence the outbreak was caused by a mutated strain of strepococcus suis.

Streptococcus has been added to a list of diseases that must be reported to city health authorities to let the government track the disease more closely.

Yongshun Biomedical Co. ships the first batch of vaccines yesterday for streptococcus swine type II, enough for 350,000 pigs.

The company plans to eventually produce enough vaccines for 10 million pigs. The drugs must be injected twice within a 15-day period; offering the pigs an immunization period of more than four months.