Avian_influenza
Centers_for_Disease_Control_and_Prevention
Common_cold
Epidemic
European_Centre_for_Disease_Prevention_and_Control
Fever
Flu_season
Human_influenza
Influenza
Influenza-like_illness
Influenza_pandemic
Influenza_research
Influenza_treatment
Influenza_vaccine
Influenza_virus
Influenza_A_virus
Influenzavirus_B
Influenzavirus_C
Influenza_A_virus_subtype_H1N1
Influenza_A_virus_subtype_H2N2
Influenza_A_virus_subtype_H3N1
Influenza_A_virus_subtype_H3N2
Influenza_A_virus_subtype_H5N1
Influenza_A_virus_subtype_H5N2
Oseltamivir
Pandemic
Swine_influenza
Tamiflu
Vaccine
Main_Page
1918_flu_pandemic
Add English keywords (taken from McIver and Brownstein paper).
[data] Add English keywords (taken from McIver and Brownstein paper).

The only page missing is Influenza Virus Subtype H2N9 which apparently
does not exists anymore.
