antigenic shift
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phenotype
Entity
influenza A virus
Entity
bird
Entity
mammal
Entity
virus
Entity
protein
Entity
genetics
Entity
influenza
Entity
eukaryote
Entity
BBC
Concept
immunity
Entity
lipid
Entity
ribonucleic acid
Entity
prokaryotes
Entity
digital object identifier
Entity
International Standard Serial Number
Entity
swine influenza
Entity
1918–1920 flu pandemic
Entity
mutation
Entity
pathogen
Entity