== Natural cotton rats were immunized with 107pfu rVSV-F, rVSV-G, or rVSV-G-2A-F via intranasal path, and boosted using the same dosage via the same path 4 weeks later on
== Natural cotton rats were immunized with 107pfu rVSV-F, rVSV-G, or rVSV-G-2A-F via intranasal path, and boosted using the same