To test for meningitis in infants, a cerebrospinal fluid (CSF) puncture is usually done to look for increased pressure in the CSF, changes in cell counts, proteins, and sugars in the CSF to differentiate between the presence of meningitis and which type of meningitis is present. Screening for inflammatory markers such as blood counts, C-reactive protein, calcitoninogen, etc. are also needed to consider whether the inflammation is viral or bacterial, or caused by other infections. Imaging tests are also needed. Magnetic resonance imaging (MRI) of the head is usually the preferred test for meningitis and has a high specificity and sensitivity for diagnosing meningitis, and an electroencephalogram (EEG) that shows an increase in the number of slow waves is usually suggestive of meningitis. All laboratory tests, imaging tests, etc. are for clinical reference, but it is still important to pay attention to the clinical symptoms and signs. Meningitis in infants may include poor mental health, different degrees of fever, resistance in the neck, obvious signs of meningeal irritation, and different degrees of vomiting, especially projectile vomiting.