Currently there are six domestic production, including the best production of Lan Veterinary Research (China Agricultural Witte), because it is the national foot-and-mouth disease standard laboratory. It produces two kinds of, one is supplied to the government free distribution, generally do not use, use also does not work, one is the "group special supply", generally a little bit bigger farms are used, but it is not good to buy, and very expensive.
There is also a Bureau Veritas production of high-efficiency special seedlings can also be, it is the only use of bio-suspension technology production, but also not cheap.