Table 1. Survival time (days) of suckling mice injected intracranially with Rabensburg virus isolates 97-103 and 99-222.

Suckling mouse brain (SMB) passage no.	Strain 97-103		Strain 99-222
	Average survival time	Range	Average survival time	Range
SMB0*	12.1	12–13	12.2	9–15
SMB1	8.5	7–10	11.8	11–13
SMB2	8.5	7–11	10.0	9–11
SMB3	8.1	7–9	8.7	7–10

*Represents the original mosquito suspension during virus isolation attempts.