Hypothesis 1: effective strategies in a gradual increase in tuberculosis notification in the case of poor tuberculosis surveillance. (a) Result of the prediction made by the model when the notification of new tuberculosis cases is gradually increased. The red curve shows the poor notification rate situation, which represents the present situation of tuberculosis in Nigeria (the blue stars). The rest of the curves represent a change in case detection and increasing in the notification of new cases by some percentages over a period of time. (b) Result of the prediction made when the notification of new tuberculosis cases is suddenly increased.