Table 1

Loops description

LoopDescription
R1R1 loop explains the dynamic according to which the more vulnerable population, the more people get infected. Once healed, these people get antibodies and can be considered immune for the following period
R2This loop shows that the more people get vaccinated, the more population can be considered non-vulnerable. The vaccine effect will last for about 6 months, and then the vaccinated will be considered vulnerable again
R3It shows the dynamic according to which the more vaccines are available, the more people get vaccinated. On the other hand, vaccination decreases the stock of vaccines available
R4According to this loop, the more people get vaccinated, the fewer restrictions the health authorities impose on the population. These restrictions reduce contact between people and, thus, infections
B1This loop portrays the dynamics according to which the more people get infected, the less the stock of vulnerable people is
B2According to this loop, the more people get vaccinated, the less the stock of vulnerable people is
B3This loop shows that the more people need vaccines, the more hubs, and human resources are activated for the vaccination campaign. This positively influences the number of vaccines inoculated, decreasing the stock of vulnerable people
B4 & B5This loop portrays the dynamics according to which the more people get infected (or hospitalized), the more restrictions to reduce contact will be introduced

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