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CDC influenza surveillance report no. 45, March 20, 1959
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    I. Summary of information -- II. Current analysis of influenza in the United States -- III. Current analysis of influenza and pneumonia mortality

    "Twenty States and the District of Columbia have now reported outbreaks of influenza-like illness, or laboratory confirmations of the presence of influenza since early in February, 1959. In ten of these States and the District isolation or serologic study has confirmed the presence of Type B influenza. All reports indicate that this virus is closely related to other Type B influenza agents which have been isolated in this country and abroad in the past few years. No additional Type C isolates have been reported in 1959 since the report from Michigan in mid-February. Asian (A2) isolations have been reported to date in 1959 only from New York City (a total of 4 isolates now) and Miami Florida (one isolate from a family outbreak). Other Type A agents, not yet characterized as to subtype, have been reported from Utah and California. Influenza and pneumonia deaths for the week ending March 14, rose slightly (to 517) from the level of the previous five weeks. The figure still stands close to the normal threshold. The greatest increases in reported deaths over the previous week were recorded from the Middle Atlantic and Pacific States. The absence of excess influenza and pneumonia mortality appears to be consistent with the fact that the majority of outbreaks are occurring among school children. The adult population seems to have been little affected to date, perhaps as the result of prior experience with similar strains of Type B. Industrial absentee rates remain normal for the season. It may be worthy of note, in considering the absence of excess mortality, that the Type B illness has been generally reported as milder and of shorter duration than the illness caused by the Asian (A2) strain." - p. 2

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