Table 2.

Frequency of infection following murine ocular inoculation by virus subtype.

Virus subtypea	# of viruses	# infected mice	# mice inoculated	% Infected	Risk ratiob	p-valuec
H7	18	116	176	66%	–	–
Non-H7	16	27	116	23%	2.8	2E–17
H1	8	3	48	6%	10.5	3E–19
H3	2	1	12	8%	7.9	2E–04
H5	6	23	56	41%	1.6	4E–05

^aNon-H7, inclusive of all viruses listed in Table 1.

^bRisk ratio for H7, using the indicated subtype as a reference.

^cp-value determined by Fisher’s exact test.