The probability of each disease type given the presence or absence of symptoms is:

Here is what a dump of the Bayes object looks:

Bayes Object
(
    [m] => 3
    [n] => 4
    [row_labels] => Array
        (
            [0] => ++
            [1] => +-
            [2] => -+
            [3] => --
        )

    [column_labels] => Array
        (
            [0] => d1
            [1] => d2
            [2] => d3
        )

    [priors] => Array
        (
            [0] => 0.322
            [1] => 0.214
            [2] => 0.464
        )

    [likelihoods] => Array
        (
            [0] => Array
                (
                    [0] => 0.656
                    [1] => 0.094
                    [2] => 0.219
                    [3] => 0.031
                )

            [1] => Array
                (
                    [0] => 0.186
                    [1] => 0.062
                    [2] => 0.559
                    [3] => 0.193
                )

            [2] => Array
                (
                    [0] => 0.109
                    [1] => 0.766
                    [2] => 0.016
                    [3] => 0.109
                )

        )

    [posterior] => Array
        (
            [0] => Array
                (
                    [0] => 0.70034348765964
                    [1] => 0.13197087649033
                    [2] => 0.16768563585003
                )

            [1] => Array
                (
                    [0] => 0.075867254862643
                    [1] => 0.033256466813716
                    [2] => 0.89087627832364
                )

            [2] => Array
                (
                    [0] => 0.35693027210884
                    [1] => 0.60549279235504
                    [2] => 0.037576935536119
                )

            [3] => Array
                (
                    [0] => 0.097997251129001
                    [1] => 0.40547810720597
                    [2] => 0.49652464166503
                )

        )

    [evidence] => Array
        (
            [0] => 0.301612
            [1] => 0.39896
            [2] => 0.197568
            [3] => 0.10186
        )

)