understanding the reproduction definition understanding the reproduction definition
Post on 17-Dec-2015
232 Views
Preview:
TRANSCRIPT
Understanding the Reproduction Definition
Reproduction Ratio (R0). Definition
It is the expected number of secondary cases produced by a primary case
Ex. R0=4
Pre
vale
nce
Nb
of in
fect
ed a
nim
als
Time
The pathogen is able to invade the susceptible
population
R0 over 1
Pre
vale
nce
Nb
of in
fect
ed a
nim
als
Time
The pathogen remains at the same level
R0 equal 1
R0 below 1 Between-animal transmission cannot maintain a disease in a
population
Time
Pre
vale
nce
Nb
of in
fect
ed a
nim
als
.
R0 =1
Pre
vale
nce
Nb
of in
fect
ed a
nim
als
Time
R0 > 1 the pathogen is able to invade the susceptible population
R0 < 1 between-animal transmission cannot maintain a disease in a population
Reproduction Ratio (R0 ). Effect
top related