Figure 3.

A single previous exposure to N9 can abolish the brief protective effect of N9. The low-dose inoculum (0.05 ID50) infected only a small fraction of the control group treated twice with PBS (first column), and an even smaller fraction was infected in the control group treated with 2% N9 just before delivering the inoculum (middle column). But a significantly larger fraction became infected in the test group (right-hand column), revealing that the N9 dose delivered 12-hour earlier abolished the protective effect of the N9 dose delivered just before the inoculum: P = 0.013 by Fisher's exact two-sided test.

Cone et al. BMC Infectious Diseases 2006 6:90   doi:10.1186/1471-2334-6-90
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