H-strain was isolated and attenuated by Bijlenga et al (1956) Tijdschrift Diergeneesk Vol 81:43, "Infectious bronchitis in chicks in the Netherlands" Tijdschr. Diergeneesk. (1960) 85:320 Tijdschr. Diergeneesk. (1960) 85:279 Tijdschr. Diergeneesk. (1960) 85:398.
The H52 and H120 strains have been passaged 52 and 120 times respectively in embryonated chicken eggs and have a relatively broad immunizing capacity. The H standing for the initial letter of the name (Huyben) of the owner of the broiler farm in the province of Brabant, in the southern part of the Netherlands, from which the virus was isolated.
793B: The first isolation of the 793/B type of IBV type was in 1985, in France. Cavanagh et al., 1998; Sequence analysis of strains of the 793/B genotype (CR88, 4/91) of IBV isolated between 1985 and 1997. Proceedings of the International Symposium on Infectious Bronchitis and Pneumovirus Infections in Poultry, June (pp. 252-256). Rauischholzhausen , Germany.
The GA08 strain was first identified in the southeastern United States, specifically in northern Georgia, during an outbreak in 2007–2008. Phylogenetic analyses place GA08 in Genotype I, lineage 27 (GI-27)