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Table 1 Symbols used in the model

From: Endemic and epidemic dynamics of cholera: the role of the aquatic reservoir

Symbol Description
State Variables  
S number of susceptibles
I number of infected
B concentration of toxigenic V. cholerae in water (cells/ml)
Parameters  
H total human population
n Human birth and death rates (day-1)
a rate of exposure to contaminated water (day-1)
K concentration of V. cholerae in water that yields 50% chance of
  catching cholera (cells/ml)
r rate at which people recover from cholera (day-1)
nb growth rate of V. cholerae in the aquatic environment (day-1)
mb loss rate of V. cholerae in the aquatic environment (day-1)
e contribution of each infected person to the population of V. cholerae
  in the aquatic environment (cell/ml day-1 person-1)