Related by context. Frequent words. (Click for all words.) 57 infectivity 56 pathogenicity 53 transmissible 52 virulence 51 infectiousness 51 causative agent 50 pandemic strain 50 reassortment 50 influenza viruses 50 Wolbachia 50 influenza virus 49 multidrug resistant 49 Influenza viruses 49 genetic variability 49 zoonotic 49 prion diseases 49 SARS coronavirus 49 avian influenza viruses 49 infecting humans 49 herd immunity 48 avian flu viruses 48 viral strains 48 flu virus 48 pulmonary TB 47 easily transmissible 47 antigenic 47 predisposing factors 47 Flu viruses 47 avian virus 47 pandemic H#N# virus 47 latent infection 47 mutational 47 serotype 47 pathogen 47 H#N# subtype 47 swine origin 47 infects humans 46 respiratory droplets 46 H. pylori infection 46 susceptibility 46 bacterial pathogens 46 mutations 46 virus mutates 46 H#N# viruses 46 H#N# swine 46 genotypic 46 mutation 46 genetic diversity 46 influenza 45 respiratory viruses 45 coli 45 dengue virus 45 titers 45 morphologic 45 coronavirus 45 prion protein 45 avian influenza virus 45 Toxoplasma 45 flu viruses 45 enzymatic activity 45 mutant strain 45 pathogenic 45 Shigella 45 infect humans 44 prion disease 44 aneuploidy 44 influenza A/H#N# 44 P. aeruginosa 44 PrP 44 H. pylori 44 relatedness 44 CMV infection 44 S. pneumoniae 44 prions 44 Lubroth 44 mammalian species 44 immunodeficiency 44 microbiota 44 P. falciparum 44 Antibiotic resistance 44 mycobacteria 43 coronaviruses 43 communicable 43 malaria parasites 43 organism 43 conductance 43 foodborne 43 pathogens 43 Mycobacterium tuberculosis 43 pandemic H#N# influenza 43 Campylobacter 43 asexual reproduction 43 avian flu virus 43 Giardia 43 infectious disease 43 H#N# influenza virus 43 malaria parasite 43 pandemic 43 highly pathogenic H#N# 43 mycoplasma 43 mtDNA