It can be seen PCR is increasingly widely used in the diagnosis of disease. Table 2 summarizes a number of diseases, and the number of subjects studied in recent times, most focus on diseases caused by bacteria or a virus. As for the parasitic disease, the application of biotechnology in diagnosis is very little (Dan Tran Thi Ngoc Tuan and Nguyen, 2006).
Along with disease diagnosis, for avian influenza viral H5N1, Le Thanh Hoa et al (2006) isolated and deciphered the entire genetic sequence of the H5 strain of A/H5N1 (1707 nucleotides) on breeding ducks in An Giang province, of which there are 11 species DkAG wrong location 2 completely different compared to other strains from Vietnam, Laos, and 3 1 isolates from strains of China. The analysis results also showed that pedigree A/Dk/Vietnam/AG/2005 strains originating from Guangdong
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