Topic
Communicable Diseases and their Control
Human
10
Iceland
10
Influenza
Norway
Canada
8
Spain
8
Switzerland
8
epidemiology
8
Israel
6
United States
6
isolation and purification
6
Czech Republic
4
Denmark
4
Disease outbreaks
4
Finland
4
France
4
Germany
4
Influenza A virus
4
Ireland
4
Latvia
4
Orthomyxoviridae
4
Poland
4
Portugal
4
Russian Federation
4
Serbia and Montenegro
4
Thailand
4
United Kingdom
4
Austria
2
Belgium
2
Croatia
2
Egypt
2
Hungary
2
Iran (Islamic Republic of )
2
Italy
2
Japan
2
Mongolia
2
Netherlands
2
Slovakia
2
Sri Lanka
2
Sweden
2
Zambia
2
epidemiology isolation and purification
2