TABLE 4.

Relative spirochete loads in larvae fed on WT versus SCID mice^a

B. burgdorferi strain genotype	Median spirochete load in infected larvae fed on:		Ratio of loads in SCID mice to loads in WT mice
	WT mice	SCID mice
WT	7,200	28,650	4
ΔospA	50	4,300	86
ApospC	50	1,540	30.8
ApospA	1,400	9,000	6.4
ApospB	1,500	19,800	13.2

^aData are derived from results for days 7 to 10 after dropoff (Fig. 2A and 4A).