1 Influenza -> 8 subcats, 46 articles
2 Anti-influenza agents -> 1 subcat, 8 articles
3 Neuraminidase inhibitors -> 9 articles
2 Avian influenza -> 11 articles
2 Deaths from influenza -> 2 subcats, 109 articles
3 Deaths from the 1889€“90 flu pandemic -> 15 articles
3 Deaths from the 1918 flu pandemic -> 136 articles
2 Influenza A virus -> 1 subcat, 9 articles
3 Subtypes of Influenza A virus -> 2 subcats, 23 articles
4 Influenza A virus subtype H1N1 -> 2 subcats, 7 articles
5 1918 flu pandemic -> 1 subcat, 13 articles
5 2009 flu pandemic -> 4 subcats, 14 articles
4 Influenza A virus subtype H5N1 -> 20 articles
2 Influenza pandemics -> 3 subcats, 20 articles
3 1889€“90 flu pandemic -> 1 subcat, 4 articles
4 Deaths from the 1889€“90 flu pandemic -> already queried
3 1918 flu pandemic -> already queried
3 2009 flu pandemic -> already queried
2 Influenza researchers -> 17 articles
2 Influenza vaccines -> 12 articles
2 National Influenza Centres -> 4 articles
18 unique categories scanned, with in total 443 unique articles (namespace 0), in 1 seconds.