Systematic Veterinary Virology

STRAINS AND SEROTYPES

• There are two distinct serotypes of the virus named as Serotype 1 and Serotype 2, which are both capable of infecting chicken as well as some other species of domestic poultry like turkey and ducks.
• However, only serotype 1 cause clinical disease in chickens younger than 10 weeks.
• Serotype 2 does not cause any clinical disease in chickens.
• Using molecular techniques, serotype 1 has been further subdivided into six distinct groups