The classic triad of diagnostic signs consists of nuchal rigidity, sudden high fever, and altered mental status; however, all three features are present in only 44–46% of bacterial meningitis cases.
Triad klasik dari tanda-tanda meningitis adalah kaku kuduk, demam tinggi tiba-tiba, dan perubahan status mental; namun, ketiga ciri-ciri ini hanya muncul pada 44–46% kasus meningitis bakteri.