Table 5.
Search terms related to spillover effects in included texts by academic fieldb
| Economics | Geography | Public health | Total | |
|---|---|---|---|---|
| Indirect effect*a | 12 | 2 | 13 | 27 |
| Spillover*a | 23 | 0 | 1 | 24 |
| Externalit*a | 19 | 0 | 0 | 19 |
| Seconda*a | 3 | 3 | 10 | 16 |
| Indirect protection | 0 | 4 | 11 | 15 |
| Herd protect*a | 0 | 2 | 12 | 14 |
| Diffusion | 7 | 1 | 3 | 11 |
| Herd immunity | 1 | 4 | 5 | 10 |
| Herd effect*a | 0 | 0 | 10 | 10 |
| Peer effect*a | 9 | 0 | 0 | 9 |
| Unexpected | 2 | 0 | 3 | 5 |
| Interference | 2 | 0 | 2 | 4 |
| Indirect protective | 0 | 0 | 4 | 4 |
| Contagion | 3 | 0 | 0 | 3 |
| Unexpected benefit*a | 0 | 0 | 1 | 1 |
aAsterisks at the end of search terms indicate wild-card characters allowed at the end of the search term. For example, ‘externalit*’ would retrieve search results for ‘externality’ and ‘externalities’.
bCounts allow for multiple terms per included text.