Table 5.

Viral diversity and bird strains present on farms.

Farm	Bird strain
	Red Pedigree & Grey	Cobb	Cobb & Red Pedigree	Cobb × Hubbard	Hubbard & Ross	Hubbard	Red Pedigree	Silkie	Unknown mixed breed
A	1	1–6	1	1	1, 4, 6	1
B							1
C				1			1
D		1, 7
E		1
F	1
G							1, 7
H							1
I								9–12+	9 and/or 13
J		8			8
K							7
L		7
M					1

Numbers represent viral haplotype; ‘&’ a mixed flock of two bird strains; ‘×’ a strain cross.