Related terms:
flu
cdc
pigs
strain
virus
vaccine
new strain
pandemic
swine flu
viruses
severity
influenza
flu viruses
outbreak
flu pandemic
infected
circulating
hemagglutinin
swine influenza
avian influenza
surveillance
swine flu outbreak
influenza viruses
influenza a virus subtype
centers for disease control
disease control and prevention
Wikipedia sources:
2009 flu pandemic
Pandemic H1N1/09 virus
Influenza vaccine
Pandemic Severity Index
2009 flu pandemic in the United States
Context for words:
seasonal
flu
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