Limiting worker exposure to highly pathogenic avian influenza a (H5N1): a repeat survey at a rendering plant processing infected poultry carcasses in the UK

Table 2 Administration of pre-exposure antiviral prophylaxis by occupational risk category comparing different risk assessment approaches used in incident I and incident II.

Occupational risk group	Total worker population	At risk population in receipt of intervention				Absolute difference
	N	Incident I		Incident II		P2 - P1
		n	% (P1)	n	% (P2)
A (high risk)	37	17	46	15	41	-5
B (medium risk)	17	12	71	9	53	-18
C (low risk)	35	18	51	24	69	17
D (negligible risk)	68	25	37	7	10	-26
TOTAL	157	72	46	55	35	-11

ISSN: 1471-2458