AI Article Synopsis

  • A cell-culture fowlpox vaccine proved to be effective and safe when given to day-old broiler chicks alongside a Marek's vaccine, with no negative impact on the Marek's vaccine's efficacy.
  • Chick embryo-derived pox vaccines also showed strong protection but caused swelling in the muscle when administered intramuscularly.
  • In contrast, the cell-culture fowlpox vaccine did not result in any swelling when improperly injected into muscle, highlighting its safety profile.

Article Abstract

Laboratory and field studies indicated that a cell-culture fowlpox vaccine was effective and safe when administered subcutaneously to day-old broiler chicks in combination with cell-associated Marek's vaccine without compromising the latter. Pox vaccines of chick embryo origin evaluated similarly provided excellent protection, although they caused local musculature swelling when injected into muscle rather than under the skin. No muscle swelling followed improper vaccination with the cell-culture fowlpox vaccine.

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