  Many vector-borne disease epidemic models neglect the fact that in modern
human civilization, social awareness as well as self-defence system are
overwhelming against advanced propagation of the disease. News are becoming
more effortlessly accessible through social media and mobile apps, while
apparatuses for disease prevention are inclined to be more abundant and
affordable. Here we study a simple host-vector model in which media-triggered
social awareness and seasonality in vector breeding are taken into account.
There appears a certain threshold indicating the alarming outbreak; the number
of infective human individuals above which shall actuate the self-defence
system for the susceptible subpopulation. A model where the infection rate
revolves in the likelihood of poverty, reluctancy, tiresomeness, perceiving the
disease as being easily curable, absence of medical access, and overwhelming
hungrier vectors is proposed. Further discoveries are made from undertaking
disparate time scales between human and vector population dynamics. The
resulting slow-fast system discloses notable dynamics in which solution
trajectories confine to the slow manifold and critical manifold, before finally
ending up at equilibria. How coinciding the slow manifold with the critical
manifold enhances periodic forcing is also studied. The finding on hysteresis
loops gives insights of how defining alarming outbreak critically perturbs the
basic reproductive number, which later helps keep the incidence cycle on small
magnitudes.
