Table 8. Comparison of conjunctivitis and serologic result case definitions for number of infections and use of respirators and safety glasses during avian influenza A (H7N7) epidemic, the Netherlands, 2003*.

Use of respirator	Use of safety glasses	Conjunctivitis			Serology
		Persons†	Visits‡		Persons	Visits
Always	Always	3/28	5/60		11/19	30/44
	Sometimes	7/25	16/76		12/19	38/53
	Not used	7/38	14/65		19/27	32/45
Sometimes	Always	–	–		–	–
	Sometimes	4/25	13/84		10/18	40/62
	Not used	5/28	12/62		10/22	19/45
Not used	Not used	4/14	6/34		4/4	8/8
Unknown	Unknown	6/35	13/72		15/22	32/43

*Data resulted from a survey conducted among poultry workers after the epidemic. Totals of respirator and safety glasses use can be derived by adding up the separate groups. –, no data in this group.
†No. infected persons/total no. persons.
‡No. visits by infected persons/total no. visits.