Table 3. Study participants with detectable microneutralization assays titers against A/Equine/Mongolia/01/2008(H3N8) or A/Hong Kong/1073/1999(H9N2), with seroconversions.

ID	Sex	Age(yrs)	H3N8(enroll)	H3N8(12 mo)	H3N8(24 mo)	H9N2(enroll)	H9N2(12 mo)	H9N2(24 mo)	Horse exposed during12 months before4-fold rise in titer	Poultry exposed during12 months before4-fold rise in titer
110	Male	45	<1∶10	1∶20*	1∶10				Yes
308	Female	47	<1∶10	1∶20*	<1∶10				No
360	Male	35	<1∶10	1∶20*	<1∶10				No
302	Female	24	<1∶10	1∶20*	missing				No
224	Female	38	<1∶10	1∶10	1∶40*				Yes
270	Female	54	<1∶10	1∶10	1∶40*				Yes
193	Female	52	<1∶10	1∶10	1∶20				Yes
123	Male	44	<1∶10	1∶10	1∶10				Yes
418	Male	28	<1∶10	1∶10	1∶10				No
119	Male	48	<1∶10	1∶10	<1∶10				No
319	Male	49	<1∶10	1∶10	<1∶10				No
403	Male	35	<1∶10	1∶10	<1∶10				No
100	Male	43	<1∶10	1∶10	missing				Yes
102	Male	58	<1∶10	1∶10	missing				Yes
362	Male	20	<1∶10	1∶10	missing				No
297	Male	45	<1∶10	<1∶10	1∶40*				No
298	Male	19	<1∶10	<1∶10	1∶40*				No
186	Male	31	<1∶10	<1∶10	1∶20*				Yes
182	Male	47	1∶10	<1∶10	1∶10				Yes
290	Male	33	<1∶10	<1∶10	1∶10				No
301	Male	40	<1∶10	missing	1∶20				Yes
89	Male	57				<1∶10	1∶20*	<1∶10		No
68	Female	53				<1∶10	1∶10	<1∶10		No
222	Female	56				<1∶10	1∶10	<1∶10		No
240	Male	47				<1∶10	1∶10	<1∶10		No
221	Male	65				<1∶10	<1∶10	1∶40*		No
239	Male	55				<1∶10	<1∶10	1∶20*		No
338	Male	23				1∶10	missing	1∶10		Yes
337	Female	51				<1∶10	missing	1∶10		Yes

enroll = enrollment; 12 mo = 12 month annual follow-up; 24 mo = 24 month annual follow-up;

 = 4-fold rise in titer between 2 timer periods;