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Canada
11
Iceland
11
Norway
11
Spain
11
Human
10
Influenza
10
Communicable Diseases and their Control
9
Israel
9
Switzerland
9
United States
9
Finland
7
epidemiology
6
Croatia
5
Denmark
5
France
5
Italy
5
Latvia
5
Russian Federation
5
United Kingdom
5
Czech Republic
4
Disease outbreaks
4
Germany
4
Ireland
4
Orthomyxoviridae
4
Thailand
4
epidemiology isolation and purification
4
isolation and purification
4
Austria
3
Belarus
3
Iran (Islamic Republic of )
3
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