1.The Point has been made that only a competent virus laboratory can establish a definitive etiologic diagnosis that will distinguish’ which of a number of arboviruses is the cause of what is now commonly called primary encephalitis.2.As is obvious to most of us, this colloquium has been held at an unusual time in the history of immunology. What is unusual is not so 1.The Point has been made that only a competent virus laboratory can establish a definitive etiologic diagnosis that will distinguish ’which of a number of arboviruses is the cause of what is now commonly known primary encephalitis.2.As is obvious to most of us , this colloquium has been held at an unusual time in the history of immunology. What is unusual is not so