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Why is my vaccination programme not working?

[Mumo Munuve, Standard]

In poultry production systems, there are diseases that are too widespread or difficult to eradicate. These diseases or ailments require a routine vaccination program.

For long-living birds like commercial layers and improved 'Kienyeji' chickens, routine vaccinations are administered against Marek's disease, Newcastle disease (NDV), Infectious bronchitis (IB), Infectious bursal disease (IBD or Gumboro), Salmonella, and fowl pox.

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