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Key words: Newcastle Disease Virus, NDV-free status, pathogenicity, broiler chickens, biological

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Table 2. NDV isolates in each passage in embryonated chicken eggs (SPF) in relation to the total number of samples
Table 3. NDV isolates by passages in embryonated chicken eggs, according to vaccination  NDV isolates (n)*  Isolation / Total Passages
Table 5. Grouping of NDV isolates and vaccine strains by ICPI and region

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