The Epidemiological Implications of Deer Fly Nuisance Biting and Transmission of Loiasis in an Endemic Area in Southeastern Nigeria

Table 1

Monthly entomological indices of human-landing Chrysops sp. in southeastern Nigeria.

Month	No. of catch days	No. of female Chrysops				No. L3s (L3/inf.Ch)^a	MBR^b	MTP^c
		Collected	Dissected (%)	Parous (%)	Infective (%)
September 2005	4	75	62	16 (25.81)	3 (4.8)	25 (8.3)	281	113
October 2005	4	71	66	23 (34.8)	2 (3.0)	23 (11.5)	275	96
November 2005	5	78	67	26 (38.8)	1 (1.5)	9 (9.0)	234	31
December 2005	5	63	54	21 (38.9)	0 (0.0)	0 (0)	195	0
January 2006	4	67	58	23 (39.7)	1 (1.7)	5 (5.0)	260	24
February 2006	4	78	69	28 (40.6)	2 (2.6)	17 (8.5)	273	67
March 2006	4	75	66	19 (28.8)	2 (3.0)	21 (10.5)	291	93
April 2006	4	78	76	18 (23.7)	3 (3.9)	29 (9.7)	293	112
May 2006	6	86	79	16 (20.3)	2 (2.5)	11 (5.5)	222	31
June 2006	4	88	81	17 (21.0)	4 (4.9)	31 (7.8)	330	126
July 2006	4	91	88	18 (20.5)	7 (8.0)	97 (13.9)	353	389
August 2006	4	80	78	22 (28.2)	5 (6.4)	46 (9.2)	310	183
Total	52	930	844	247 (29.3)	32 (3.8)	314 (9.8)	3317^b	1265^e

^aL3/inf.Ch: number of L3 per infective Chrysops.
^bMBR: monthly biting rate an estimate of the number of a particular vector coming to bite a person who is exposed to biting during all biting hours of the vector every day for one month.
^cMTP: monthly transmission potential an estimate of the level of transmission of infective larvae (l3) to a person during one month.
^dFigure represents annual biting rate an estimate of the number of a particular vector coming to bite person who is exposed to biting during all biting hours of the vector every day for one year.
^eFigure represents annual transmission potential an estimate of the level of transmission of infective larvae (l3) to a person during one year.