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During the early part of 1941 an outbreak of influenza A occurred in Holland. This study (a doctoral thesis of one of the authors) consists mainly of detailed case reports and symptom analyses on persons who were admitted to the hospital during the epidemic, especially those who had complications involving the respiratory tract such as tonsillitis and pneumonia. The laboratory data on these cases are incomplete and the authors do not include any epidemiologic data or information as to morbidity rates either of influenza or its complications. The report is of value mainly as part of a mosaic of information on the worldwide occurrence of various influenza epidemics.
Studies on the Influenza A-Epidemic of January-March 1941 at Groningen (Holland). JAMA. 1947;135(15):1039. doi:10.1001/jama.1947.02890150083029