Systematic Veterinary Virology

STRAINS AND SEROTYPES

• There are 14 serogoups and these serogroups in total contain 24 serotypes. The serogroups are differentiated by immunological tests that identify viral proteins, which are unique for each serogroup.
• Most serogroups are immunologically distinct, but there is considerable cross-reaction between members of the BT and EHD serogroups. (EHD - epizootic haemorrhagic disease is a viral infection caused by a orbivirus and has clinical symptoms same as BT)