Related by context. Frequent words. (Click for all words.) 66 smallpox virus 57 Smallpox 56 pandemic influenza virus 56 smallpox 53 herpes viruses 53 Bacillus anthracis 53 coronaviruses 53 avian influenza viruses 52 mutant strain 52 P. falciparum 52 Bt toxin 52 TSEs 52 Chlamydia trachomatis 52 varicella zoster virus 51 bacterial strains 51 Mycobacterium tuberculosis 51 anthrax toxin 51 inhalational anthrax 51 oseltamivir Tamiflu 51 pathogens 51 multidrug resistant 51 protozoan 51 mutant strains 50 S. pneumoniae 50 influenza virus 50 poliovirus 50 Salmonella bacteria 50 herpesvirus 50 rinderpest 50 Prions 50 Toxoplasma 50 vaccinia virus 50 vaccinia 50 Plasmodium falciparum 50 viral strains 50 SARS coronavirus 50 viral pathogens 50 organisms 49 fungal pathogens 49 anthrax bacteria 49 phage 49 Tularemia 49 influenza viruses 49 virulence factors 49 bacteriophages 49 chytrid fungus 49 virulent strains 49 Salmonella Typhimurium 49 neuraminidase inhibitors 49 pathogenic organisms 49 Neu5Gc 49 H#N# subtype 49 transgenes 49 human immunodeficiency virus 49 retrovirus 49 Ebola virus 49 pathogen 49 rhinoviruses 49 Antiviral drugs 49 genetic alteration 49 smallpox vaccines 48 rhinovirus 48 avian flu viruses 48 exosomes 48 mAbs 48 RNA viruses 48 retroviruses 48 viral genome 48 infectious pathogens 48 viruses 48 Pathogens 48 deadly Ebola virus 48 simian immunodeficiency virus 48 Bovine Spongiform Encephalopathy BSE 48 Influenza viruses 48 immunodeficiency 48 bacilli 48 microorganism 48 parasitic worms 48 Antivirals 48 Plasmodium 48 influenza pandemics 48 bacterium 47 organism 47 highly pathogenic avian influenza 47 avian flu epidemic 47 Human Papillomavirus 47 bacterial spores 47 ricin toxin 47 bacteria fungi 47 Pathogen 47 antimicrobial peptides 47 anthrax 47 microorganisms 47 VLPs 47 pandemic influenza vaccines 47 oncolytic viruses 47 neutralizing antibodies 47 pneumococcal bacteria 47 Ebola 47 Haemophilus influenzae