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Microparasite and Macroparasite - Host Dynamics




The screen shot of the simulator is as shown below.




User Instructions:

 The simulator consists of three regions: the simulator's viewable window, the variables menu and the simulation control menu.

The Variables Menu:

The variables menu section consists of two sub-tabs for the simulation of both Microparasite and Macroparasite – host dynamics.




Both of the above models have its own specific parameters.

•    For  Microparasite – Host Dynamics:




The values entered in the 'Variables' Menu of both the models are default values. User can change the values for the parameters according to the Data to be tested. The parameters of the Microparasite – host dynamics model include Initial Population (n) ,No.of susceptible individuals(x1),  No. Of Infected individuals(x2), Probability of disease transmission (b), Rate at which resistant individuals become susceptible (p), Birth / Death rate (d) , Rate at which infected individuals become resistant (u) and Number of steps (in years).

•    For  Macroparasite – Host Dynamics:




Same as that of Microparasite model, this also has some default values for the parameters. There is one more button ‘More Variables’ is there in the variables menu. By clicking on this button, we will get a ‘more variables’ window (as shown in the figure), which contains some additional parameters too.

The parameters of the Macroparasite – host dynamics model include, Birth rate of host in absence of parasite (b, Death rate of host in absence of parasite  (d), Effect of parasite on birth and death rate of host (a), Rate at which parasite enter a host from the environment (c) , Natural mortality rate of adult parasite in the hosts (u), Rate at which immature parasites released into the environment (p) , Death rate of immature parasite in the environment outside the host (m), Spatial distribution / clumping factor (k), Abundance of parasite in the environment (fs) = 0 to 1000 with an increment of 10. This parameter will look good to implement as 3-slider bars (like the way we did in the previous experiment). For 3 slider bars set minimum 0 and maximum 1000.


Simulation Controls Menu:




These set of buttons are used for controlling the simulation. ‘Step Run' button is meant for manually running the simulator, step by step.  ‘Run Iterations', as the literal word meaning runs the simulator slowly each step by step with the same previously entered values repeatedly till the T time, can also be paused in between to get the values at the corresponding, desired time. 'Play/pause' button as in all cases is for pausing (and continuing) the simulator at any step needed while performing Iterations (slowly, repeatedly calculating the population possible in each step). The 'Reset' button resets the simulator to the default values.

The 'Viewable Window'  has some additional buttons meant for various other purposes, The 'Statistics' button is meant for viewing the time varying change in population by each step, for the entered values in the simulator.
A sample for the ‘viewable window’ when checked for the statistics could be,




Can be checked in case of both types of model.

The next is the 'Data plots' button, on clicking will change the 'Viewable Window' to a graphical plot.




Step by Step explanation:

Step I:  Open the simulator and click the Microparasite option.




Step II:  Set different values for the parameters, or else you can use the default values. The user can insert their own values in the text box provided and can change the other values by clicking on the variable name and drag the mouse over it. All variables in the simulator is changeable as shown in the following figure.




Step III:   Click ‘Run iterations’ button.



Step IV:   The simulator will start running a give the output depending on the input. According to the values inserted we see an increase in the Pac man characters (represents population).




Step V:  After the simulation is over, click data plots to get the graphical data.

Once you complete the procedures, press the reset button of the simulation control window, to reset all parameters to its initial/default values.

Likewise the macroparasite – host dynamics can also be studied by following the above procedure.




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Cite this Simulator:

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