'Rational' exemption to vaccination is due to a pseudo-rational comparison between
the low risk of infection, and the perceived risk of side effects from
the vaccine. Here we consider rational exemption in an SI model with
information dependent vaccination where individuals use information on the
disease's spread as their information set. Using suitable assumptions, we show the dynamic implications of the
interaction between rational exemption, current and delayed information. In particular, if vaccination decisions are based
on delayed informations, we illustrate both global attractivity to an endemic state, and the onset, through Hopf bifurcations, of general Yakubovich oscillations. Moreover, in some relevant cases, we plot the Hopf bifurcation curves and we give a behavioural interpretation of their meaning.
Citation: Bruno Buonomo, Alberto d’Onofrio, Deborah Lacitignola. Rational exemption to vaccination for non-fatal SIS diseases: Globally stable and oscillatory endemicity[J]. Mathematical Biosciences and Engineering, 2010, 7(3): 561-578. doi: 10.3934/mbe.2010.7.561
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Abstract
'Rational' exemption to vaccination is due to a pseudo-rational comparison between
the low risk of infection, and the perceived risk of side effects from
the vaccine. Here we consider rational exemption in an SI model with
information dependent vaccination where individuals use information on the
disease's spread as their information set. Using suitable assumptions, we show the dynamic implications of the
interaction between rational exemption, current and delayed information. In particular, if vaccination decisions are based
on delayed informations, we illustrate both global attractivity to an endemic state, and the onset, through Hopf bifurcations, of general Yakubovich oscillations. Moreover, in some relevant cases, we plot the Hopf bifurcation curves and we give a behavioural interpretation of their meaning.