Streptococcus suis has been identified as the most common cause of meningitis in adults in Hong Kong. The disease is characterized by occupational exposure to pigs or pork. It occurs in summer, and is associated with early, severe, sensory deafness, arthritis, uveitis, and loss of balance. Examination of the cerebrospinal fluid may show an elevated white cell count with a predominance of either polymorphs or lymphocytes. Misinterpretation of the microbiological findings by inexperienced staff members may lead to a failure to correctly diagnose this disease. This is the first report of a series of cases of Strept. suis meningitis outside western Europe. Health authorities are urged to be aware of this disease in pork-consuming countries.