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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