Table 3. The citations placed in each mode of transmission group.

Agent Mode of Transmission	Citations	Total
Direct Contact	[74], [75], [77]–[84], [88], [90], [93], [97], [99]–[101], [104], [105], [107], [108], [111]–[113]	24
Non-Specific	[86], [92], [114]	3
Vector-Borne	[61], [62], [76], [85], [87], [91], [94], [95], [97], [102]–[107], [109]	15
Water-, Soil-Borne	[21], [84], [89], [91], [96], [98]	7

If a model involved multiple agents in different categories, the paper was placed in multiple groups.