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. Author manuscript; available in PMC: 2016 Nov 17.

Published in final edited form as: Transbound Emerg Dis. 2013 Mar 28;62(1):13–23. doi: 10.1111/tbed.12082

The minimum vector to host (MVH) ratio needed for long term persistence of RVF with 15% initial immunity. Plot (a) is for 500, 1000, or 1500 buffalo without an alternate host present. Persistence is not possible at 1% vertical transmission with only 500 buffalo present. Plot (b) is the MVH needed for persistence with 1000 buffalo and 1000 alternate hosts. The alternate hosts have either the same transmission rates as buffalo (1B) or 1.5 times the transmission rates of buffalo (1.5B). Plot (c) is the MVH needed for persistence with 500 buffalo and 500 alternate hosts with the same transmission rate as buffalo and with 1.5 times the transmission rate of buffalo. Adding hosts that are as good or better transmitters than buffalo decreases the MVH needed for persistence.

The minimum vector to host (MVH) ratio needed for long term persistence of RVF with 15% initial immunity. Plot (a) is for 500, 1000, or 1500 buffalo without an alternate host present. Persistence is not possible at 1% vertical transmission with only 500 buffalo present. Plot (b) is the MVH needed for persistence with 1000 buffalo and 1000 alternate hosts. The alternate hosts have either the same transmission rates as buffalo (1B) or 1.5 times the transmission rates of buffalo (1.5B). Plot (c) is the MVH needed for persistence with 500 buffalo and 500 alternate hosts with the same transmission rate as buffalo and with 1.5 times the transmission rate of buffalo. Adding hosts that are as good or better transmitters than buffalo decreases the MVH needed for persistence.