If I'm infected then individuals I randomly encounter may become infected.

Begin micro-behaviour

RANDOM-ENCOUNTER

Begin NetLogo code:
do-every 1
   [do-if my-state = "infected"
       [do-for-n the-encounter-rate
                 all-individuals with [my-state != "dead"]
           [set my-last-encounter the-other
            add-behaviours list-of-micro-behaviours "Encounter Behaviours" [POSSIBLE-INFECTION.html]]]]
End NetLogo code

Variants

Additional encounter behaviours can be added.

Related Micro-behaviours

This relies upon the POSSIBLE-INFECTION micro-behaviour to possibly infect the other. CREATE-ENCOUNTER-RATE-SLIDER defines the the-encounter-rate variable used here.

RANDOM-SPATIAL-ENCOUNTER differs from this micro-behaviour in biasing the selection of the other individual to those close by.

RANDOM-SOCIAL-ENCOUNTER selects among my acquaintances.

RANDOM-PHYSICAL-ENCOUNTER selects among those at my location.

How this works

This models individuals that have the-encounter-rate encounters per unit time period (e.g., a simulated week). Every second, if I'm still infected (i.e., my-state = "infected") then I pick the-encounter-rate other individuals (who are not dead) and give them the micro-behaviour POSSIBLE-INFECTION. If the-encounter-rate is a non-integer then the remainder is compared with a random number probabilistically to possibly include one additional individual. I also sets the my-last-encounter variable of the other individuals to me in order to keep track of how many infections I cause.

do-for-n selects n agents and sets the-other to refer to each one.

History

This was implemented by Ken Kahn.