Table 2.

Transgenic Borrelia hermsii Δvtp::ospC+ producing OspC in Ornithodoros hermsi ticks.

Weeks PIa	No. Ticks	No. and tick stageb	Midgut			Salivary Glands
			Infected	No. OspC+	% OspC+	Pairs infected	No. OspC+	% OspC+
2	2	1N, 1♂	2/2c	0/123d	0	0/0c	NA	NA
6	2	1♂, 1♀	2/2	7/200	3.5	2/2	4/95d	4.2
7	4	2♂, 2♀	4/4	25/196	12.8	2/4	100/379	26.4
11	3	3♂	2/3	10/101	9.9	2/3	210/522	40.4
29	5	4♂, 1♀	4/5	9/93	9.7	3/5	182/186	97.8
Total	16	1N,11♂,4♀	14/16	51/713	7.2	9/16	496/1182	41.6

^aPI = post infection

^bN = nymph, ♂ = male, ♀ = female

^cnumber examined/number infected

^dnumber spirochetes OspC+/number spirochetes examined