Antigenic VariationInfluenza A virusInfluenza, HumanInfluenza VaccinesInfluenza A Virus, H1N1 SubtypeInfluenza in BirdsInfluenza B virusInfluenza A Virus, H3N2 SubtypeInfluenza A Virus, H5N1 SubtypeGenetic VariationHemagglutinin Glycoproteins, Influenza VirusOrthomyxoviridaeVariant Surface Glycoproteins, TrypanosomaOrthomyxoviridae InfectionsMolecular Sequence DataGenes, ProtozoanTrypanosoma brucei bruceiInfluenza A Virus, H9N2 SubtypeHemagglutination Inhibition TestsPandemicsTrypanosomaInfluenza A Virus, H3N8 SubtypeNeuraminidaseHemagglutinins, ViralAntigens, ViralAntigens, BacterialProtozoan ProteinsAntibodies, ViralBabesia bovisInfluenza A Virus, H2N2 SubtypeAmino Acid SequenceAntigens, ProtozoanFimbriae ProteinsInfluenza A Virus, H7N7 SubtypeEpitopesNeisseria gonorrhoeaeBorreliaSeasonsTrypanosomiasisRecombination, GeneticDisease OutbreaksBase SequenceOseltamivirInfluenza A Virus, H5N2 SubtypeSequence Analysis, DNAInfluenza A Virus, H7N9 SubtypeBacterial Outer Membrane ProteinsPhylogenyPlasmodium falciparumCross ReactionsBirdsHost-Parasite InteractionsReassortant VirusesGiardia lambliaVaccinationTrypanosoma brucei gambienseNeutralization TestsInfluenza A Virus, H1N2 SubtypeBacterial ProteinsAntibodies, MonoclonalTrypanosomiasis, AfricanGiardiasisRelapsing FeverImmune EvasionSpecies SpecificityVaccines, InactivatedAntiviral AgentsAntigens, SurfaceAnaplasmaGenome, ProtozoanRNA, ProtozoanZanamivirDNA, ProtozoanAmantadineMadin Darby Canine Kidney CellsViral ProteinsPoultrySerotypingDucksVirulenceCell LineDogsCampylobacter fetusMice, Inbred BALB CGene ConversionRNA, ViralAphthovirusMutationDNA, BacterialEvolution, MolecularInfluenzavirus CImmune SeraViral Matrix ProteinsRimantadineSequence AlignmentMultigene FamilyTime FactorsErythrocytesMalaria, FalciparumFimbriae, Bacterial