Table 1.

Number of observations and hierarchical structure of data available from experimental cross-species inoculations involving rabies virus

	Incubation period	Clinical period	Virus titer in salivary glands
Individual inoculations (sample size)	443	178	278
Publications	19	15	16
Experiments	25	20	20
Inocula	35	18	22
Source taxonomic orders/species	2/7	2/4	2/4
Inoculated taxonomic orders/species	4/19	4/13	4/18
Source-inoculated species combinations	30	20	25

Inocula refers to the different virus isolates used; publications might contain multiple discrete experiments conducted by the same research group.