Related by context. Frequent words. (Click for all words.) 62 bacteria 58 bacterium 56 malaria parasite 56 bacterial 54 H. pylori 53 prions 53 pathogen 53 influenza virus 52 spores 52 pathogens 51 flu virus 51 Staphylococcus aureus 51 harmful bacteria 51 micro organisms 51 germs 50 E. coli bacteria 50 microorganisms 50 S. aureus 50 Escherichia coli 50 parasite 50 microbes 50 dengue virus 50 antibiotic resistant bacteria 50 tuberculosis 50 flu viruses 50 drug resistant strains 50 influenza viruses 50 virus 49 sputum 49 avian influenza virus 49 immune cells 49 pathogenic bacteria 49 hepatitis C virus 48 microorganism 48 mold spores 48 pathogenic 48 avian flu virus 48 swine flu virus 47 antibodies 47 resistant bacteria 47 tuberculosis TB 47 human immunodeficiency virus 47 infected mosquitoes 47 infect humans 47 bird flu virus 47 XDR TB 47 tumor cells 47 coronavirus 47 TB 46 malignant cells 46 HBV 46 viruses 46 microbial 46 E. coli 46 organisms 46 herpes virus 46 secretions 46 microbe 46 Bacteria 46 XMRV 46 transmissible 45 antigens 45 antigen 45 prion 45 cancerous cells 45 toxin 45 saliva 45 polio virus 45 bacterial infection 44 infected mosquito 44 dendritic cells 44 Tuberculosis 44 Staph 44 epithelial cells 44 infection 44 MRSA 44 hepatitis B virus 44 infected 44 fungus 44 mutated gene 44 macrophages 44 E.coli 44 larvae 44 salmonella bacteria 43 organism 43 norovirus 43 HCV infection 43 fungal 43 Ebola virus 43 resistant strains 43 mucus 43 mosquitoes 43 drug resistant tuberculosis 42 Salmonella 42 adenovirus 42 MRSA infection 42 superbug 42 HIV 42 C. difficile 42 genetic mutation 42 antibiotics