Abstract
An outbreak of influenza virus Type B infections in children residing in The Children's Home, Inc., Winston-Salem, NC, occurred in January, 1962. Virologic studies of these infections permitted the evaluation of the effectiveness of monkey kidney cell cultures for the isolation of influenza B viruses. The influence of the serum content of the maintenance medium upon the recovery of influenza B viruses could be evaluated, since all specimens were inoculated into two tubes of rhesus kidney cultures, one of which was maintained with monkey kidney medium B (2% calf serum) 1 and the other with medium 199 (serum-free). 2 Specimens for isolation of virus and sera collected during the acute and convalescent phases of illness were available from all children admitted to the infirmary, so that a comparison of serologic and virologic techniques for the laboratory diagnosis of influenza B infections was possible. Epidemiologic and clinical data relating to this
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