To our knowledge, no reports have appeared in the literature describing changes in the electroencephalogram over a period following infectious processes which seriously affect the central nervous system. This report presents the clinical and electroencephalographic findings in a child during the course of recovery from an attack of encephalitis.
The illness developed during the period in August and September 1938 in which an epidemic of equine encephalitis appeared among horses and human beings in southeastern Massachusetts and Rhode Island. A considerable number of children and adults were affected.1 In many cases the virus was identified as the eastern variety of equine encephalitis, although in some cases such an identification was not, or could not, be made. The present case falls in the latter group, since tests did not reveal a positive neutralization reaction. In a majority of the cases of the proved equine type, as well as in a