Table 1.

Inhibition of viral infectivity. BHK-21 cells were infected with HCoV-OC43 (MOI = 0.1), and treated with compounds (10 μM) for 3 days. The table shows log₁₀ reduction in TCID₅₀/ml compared to the DMSO (negative) control (n = 3; mean ± standard error). Significance of differences was determined by ANOVA with Tukey’s multiple comparisons; ns, not significant; *, p ≤ 0.05; **, p ≤ 0.001.

Compound	log10 reduction in infectivity (mean ± SEM)
xanthone	2.04±0.58
mangiferin	3.00±0.60 **
5	2.50±0.70 *
6	2.00±0.37
7	1.95±0.28 **
8	2.20±0.23 **
10	2.42±0.56
11	2.79±0.48 *
12	2.67±0.51 *
13	2.67±0.42 *
14	2.38±0.47
15	1.95±0.25 **
16 (R = H)	2.45±0.19 **