Related by context. Frequent words. (Click for all words.) 70 infects 61 infected 61 infect 58 virus 56 infects humans 56 viruses 56 infecting 54 varicella zoster virus 54 virus mutates 53 chickenpox virus 53 herpes virus 52 Seasonal influenza 52 herpes viruses 52 Salmonellosis 51 Meningococcal disease 51 bacterium 51 infections 51 transmissible 51 virulent strain 51 dengue hemorrhagic fever 51 parasitic worms 51 mutates 51 Mycobacterium tuberculosis 50 rhinoviruses 50 reinfection 50 Plasmodium falciparum 50 Chronic wasting disease 50 herpes simplex virus 50 multidrug resistant 50 lymphatic filariasis 50 babesiosis 49 parasite 49 P. falciparum 49 Virus 49 Hepatitis B virus 49 latent infection 49 mutant strain 49 CMV infection 49 retrovirus 49 Adenovirus 49 Chickenpox 49 neurodegenerative disorder 49 Wolbachia 49 Rotavirus 49 malaria parasite 48 herpes simplex 48 disease 48 rhinovirus 48 contagious disease 48 human immunodeficiency virus 48 bacillus 48 chronically infected 48 Noroviruses 48 mosquito borne 48 parasitic infection 48 influenza virus 48 viral strains 48 Downadup 47 Viral meningitis 47 HTLV 47 coronaviruses 47 measles virus 47 parasitic disease 47 Hepatitis C virus 47 Monkeypox 47 noroviruses 47 S. pneumoniae 47 hepatitis C virus 47 Streptococcus pneumoniae 47 Spanish flu pandemic 47 vaccinates 47 Toxoplasma 47 highly contagious 47 highly pathogenic H#N# 47 Ebola 47 infecting humans 47 mosquito borne virus 47 Influenza viruses 47 infect humans 47 hemorrhagic fever 47 inactivates 46 causative agent 46 protozoan 46 Encephalitis 46 genetically susceptible 46 paralysis muscular atrophy 46 simian immunodeficiency virus 46 serotype 46 metastasizes 46 Tamiflu resistant 46 degenerative disorder 46 Strep 46 infection 46 pathogen 46 flu virus 46 mycobacteria 46 methicillin 46 shigella 46 cytomegalovirus CMV 46 poliovirus 46 immunodeficiency