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Canada
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15
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13
Human
12
Influenza
12
Communicable Diseases and their Control
9
Israel
9
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9
Disease outbreaks
8
United Kingdom
8
epidemiology isolation and purification
8
Finland
7
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7
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7
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Epidemiology and Statistics
6
France
6
Russian Federation
6
Croatia
5
Denmark
5
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5
Japan
5
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4
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4
Orthomyxoviridae
4
Portugal
4
Thailand
4
epidemiology
4
isolation and purification
4
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