TABLE 1.

Density of I. ricinus ticks collected in three cantons of Alsace in 2003-2004 and prevalence of B. burgdorferi sensu lato infection of ticks

Month or parameter	Density per 100 m2 (CI) and infection rate (%) for indicated ticks or parameter valuea
	Nymphs			Adults
	Munster	Guebwiller	Dannemarie	Munster	Guebwiller	Dannemarie
2003
April	51 (34-69), 10.3	NC	NC	4 (0-9), 27.6	NC	NC
May	103 (78-129), 21.1	248 (54-442), 8.2	NC	7 (5-9), 29.8	18 (5-31), 28.3	NC
June	110 (56-164), 13.3	308 (53-563), 9.3	NC	12 (5-18), 16.2	19 (17-22), 17.6	NC
July	117 (84-150), 17.3	203 (97-308), 6.9	29 (28-31), 5.1	12 (7-17), 21.6	8 (6-11), 13.3	0
September	31 (4-58), 21.2	39 (20-58), 11.7	6 (5-8), 33.3	3 (0-6), 25	6 (3-8), 35.7	0
October	30 (24-35), 20.3	53 (9-97), 15.9	NC	5 (1-8), 27.6	6 (6-6), 21.7	NC
Total no. of infected	119/697 (17.1)	47/487 (9.6)	5/48 (10.4)	129/557 (23.2)	44/209 (21)
ticks/examined
ticks (%)
2004
March	80 (12-149), 21.6	109 (38-180), 14.7	4 (1-6), 0	5 (1-9), 18.4	16 (4-29), 31.6	0
April	246 (38-455), 30.9	308 (156-459), 20	40 (29-51), 9.5	17 (3-30), 23.7	33 (7-58), 36	6 (2-10), 0
May	398 (26-770), 26.2	488 (303-673), 23.3	41 (24-58), 10	34 (5-63), 24.3	51 (14-89), 39.6	6 (2-10), 0
June	177 (0-384), 23.7	238 (101-375), 21.7	35 (19-51), 15	11 (3-18), 23.5	8 (2-13), 29.7	2 (0-4), 0
July	215 (0-471), 20	255 (63-447), 25	34 (21-47), 15	14 (0-29), 20	14 (1-28), 40	2 (0-4), 0
September	34 (3-65), 17.8	59 (10-107), 22.8	21 (12-31), 15	4 (0-8), 30.8	8 (1-15), 42.1	0
October	14 (0-28), 28.6	16 (0-31), 30.2	NC	4 (1-6), 8.3	7 (0-14), 32.3	NC
November	0	1 (0-2)	NC	0	1 (0-2)	NC
Total no. of infected	130/540 (24.1)	92/420 (21.9)	13/104 (12.5)	82/376 (21.8)	106/291 (36.4)	0/26
ticks/examined
ticks (%)

^aNC, no tick collection was carried out during this month.