Table 2. Potential transmission by House sparrows for epidemic and non-epidemic St. Louis encephalitis strains from Argentina.
| Viral Strain/Treatment | Susceptibility(s)a | Infectiousness(i) | Duration(d)b | Comp. index (ci)c | R. comp. index |
| 79V-2533/naïve (A) | 0.5 | 0.15 | 1.5 | 0.11 | 1 |
| CbaAr-4005/naïve (B) | 0.7 | 0.58 | 2.8 | 1.14 | 10AvsB |
| CbaAr-4005/Flavi+ (C)d | 1 | 1 | 3.5 | 3.5 | 32AvsC3BvsC |
a
s = mean ratio of viremic individuals/inoculated individuals.
b
d = mean duration of viremia in days.
c
Ci (host competence index) = s * i * d. i = infectiousness for a given bird species.
d
House sparrows with previous anti-flavivirus antibodies.