[An expert system for differentiation of viral meningitis].

The LOSTI system for viral meningitis differentiation, by using promptly accessible attributes, has been described. It is based on attribute values (averages and percentages). Logical principles on similarities and diversities are used. The system is dynamic for its ability to make itself permanently adjusted by using new cases and their attribute values. Through the possibility of prompt data processing according to a certain methodology, the system is able to take part in medical decision making. Its intention is not to make any definite decisions, just to "substitute" aetiologic diagnostics of viral meningitis in case it has not been successful or has not been done. It can also be used in epidemiological and statistical studies so long as the fact still stands that over half of the cases of serous meningitis remain aetiologically undiagnosed.