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Sign Analysis for System x ′ = y 2 (1 − x) − 0.25x, y ′ = x 2 (1 − y) − 0.25y 

Sign Analysis for System x ′ = y 2 (1 − x) − 0.25x, y ′ = x 2 (1 − y) − 0.25y 

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In this paper we find the possible phase portraits and bifurcations for a general class of host-vector epidemic models with non-linear incidence function generalizing the Ross model.