Antigenic drift
Virology
Biology
Hemagglutinin (influenza)
Clade
Influenza A virus
Antigenic variation
H5N1 genetic structure
Virus
Neuraminidase
Strain (injury)
Phylogenetic tree
Gene
Genetics
Medicine
Coronavirus disease 2019 (COVID-19)
Infectious disease (medical specialty)
Disease
Pathology
Anatomy
