Table 1.

Nucleotide identities in the 5′ UTR (nt 1–528: right-hand side) and the N-terminal coding region (nt 529–1263) of the replicase gene of 21 IBV strains

Virus	5′ UTR
	Beau	M41a	Ma5	H52	K0 751	CU 705	Conn	CU 510	Flori	CU T2	Ark 99	Ark DPI	DE 072	CU 805	CU 570	GA 98	Cal 99	CU 994	K1 699	Gra	BJ
Beau		98.7	97.2	96.2	96.6	96.4	97.0	96.2	96.4	96.2	96.0	96.2	95.8	96.2	96.4	96.0	95.6	96.0	94.3	95.8	94.7
M41a	92.9		96.8	97.2	97.5	97.3	97.0	97.2	96.8	97.2	96.6	97.2	96.8	97.2	97.3	97.0	96.6	97.0	95.3	96.8	94.9
Ma5	94.6	93.3		99.6	99.2	98.7	97.2	99.2	96.6	98.5	97.2	99.6	99.2	98.9	99.4	99.4	99.1	99.4	96.0	99.2	95.1
H52	94.6	93.3	100		99.6	99.1	97.2	99.6	97.0	98.9	97.5	100	99.6	99.2	99.8	99.8	99.4	99.8	96.4	99.6	95.5
K0751	94.1	93.2	99.3	99.3		99.1	97.5	99.2	97.3	99.2	97.5	99.6	99.2	99.2	99.4	99.4	99.1	99.4	96.2	99.2	95.3
CU705	94.0	92.8	98.6	98.6	98.0		97.3	98.7	97.2	99.1	97.7	99.1	98.7	99.4	98.9	98.9	98.5	98.9	96.8	98.7	95.8
Conn	94.4	93.3	98.2	98.2	97.6	97.1		97.2	99.4	97.2	97.3	97.2	96.8	97.2	97.0	97.0	96.6	97.0	95.1	96.8	94.2
CU510	94.4	93.2	99.7	99.7	99.0	98.4	98.0		97.0	98.5	97.2	99.6	99.2	98.9	99.4	99.4	99.2	99.4	96.0	99.2	95.1
Florida	94.4	93.3	98.2	98.2	97.6	97.1	99.7	98.0		97.0	97.2	97.0	96.6	97.0	96.8	96.8	96.4	96.8	94.9	96.6	94.0
CUT2	93.9	92.9	99.0	99.0	98.4	97.7	97.6	98.8	97.6		97.2	98.9	98.5	98.9	98.7	98.7	98.3	98.7	96.2	98.5	95.3
Ark99	94.8	92.8	97.0	97.0	96.6	95.6	97.4	96.6	97.4	96.3		97.5	97.2	97.7	97.3	97.3	97.0	97.3	96.0	97.2	94.9
ADPI	94.7	93.2	99.9	99.9	99.2	98.8	98.1	99.6	98.1	98.9	96.9		99.6	99.2	99.8	99.8	99.4	99.8	96.4	99.6	95.5
DE072	94.6	93.3	100	100	99.3	98.6	98.2	99.7	98.2	99.0	97.0	99.9		98.9	99.4	99.7	99.1	99.4	96.0	99.2	95.1
CU805	93.5	92.5	97.8	97.8	97.1	96.7	96.3	97.7	96.3	96.9	95.6	97.7	97.8		99.1	99.1	98.7	99.1	96.6	98.9	96.0
CU570	94.0	92.8	99.2	99.2	98.5	98.6	97.4	98.9	97.4	98.2	96.2	99.3	99.2	97.3		99.6	99.2	99.6	96.2	99.5	95.5
GA98	94.6	93.1	99.7	99.7	99.0	98.6	98.2	99.5	98.2	98.8	97.0	99.9	99.7	97.6	99.2		99.2	99.6	96.2	99.3	95.3
Cal99	94.8	93.6	99.7	99.7	99.0	98.4	98.5	99.1	98.5	98.8	97.3	99.6	99.7	97.6	98.9	99.5		99.2	95.8	99.1	95.1
CU994	94.4	93.2	99.6	99.6	98.9	98.2	98.1	99.3	98.1	98.6	96.9	99.5	99.6	97.4	98.8	99.3	99.6		96.2	99.4	95.3
K1699	90.8	89.7	92.1	92.1	91.9	92.1	91.5	92.0	91.5	91.3	91.2	92.3	92.1	91.6	92.3	92.1	92.3	92.0		96.0	95.7
Gray	94.6	92.8	99.5	99.5	98.8	98.4	98.0	99.2	98.0	98.5	96.7	99.6	99.5	97.3	98.9	99.7	99.2	99.0	91.9		95.1
BJ	84.8	84.6	85.8	85.8	85.5	84.6	85.6	85.8	85.6	85.4	85.0	85.6	85.8	85.2	85.2	95.5	85.9	85.6	86.0	85.2
	N-terminal coding region

Sequences with >95% identity are indicated in bold letters.

^aBecause of the overall sequence identity of the vaccine and challenge strains of M41, for brevity, only the vaccine strain is included in this table.