Molecular diagnostic assays for the detection of common bacterial meningitis pathogens: a narrative review by Diallo, K, Vitalis, FF, Ibe, L, Antonio, M, Caugant, DA, du Plessis, M, Deghmane, AE, Feavers, IM, Fernandez, K, Fox, LM, Rodrigues, CMC, Ronveaux, O, Taha, MK, Wang, X, Brueggemann, AB, Maiden, M, Harrison, OB