Table 2 Geometry of circle vs. ring. Gain in the maximum distance from the point of outbreak by using a ring instead of a circle. Presented scenarios with input parameters framed. Bold – respective calculations for scenarios not presented. Smaller inner non-vaccinated area reduces the gain, whereas a large inner radius reduces the thickness (i.e. protective ability) of the ring.
From: Emergency vaccination of rabies under limited resources – combating or containing?
Vaccinated area [km2] | ring thickness [km] | ring – inner radius [km] | ring – outer radius [km] | circle – outer radius [km] | gain [km] |
|---|---|---|---|---|---|
6400 | 20 | 30 | 50 | 40 | 10 |
10800 | 30 | 30 | 60 | 52 | 8 |
16000 | 40 | 30 | 70 | 63 | 7 |
22000 | 50 | 30 | 80 | 74 | 6 |
10800 | 43 | 10 | 53 | 52 | 1 |
10800 | 22 | 50 | 72 | 52 | 20 |