Related by context. Frequent words. (Click for all words.) 68 respiratory illnesses 68 pneumonia 63 bronchitis 63 respiratory infections 63 illness 60 viral infection 59 lung disease 59 influenza 59 illnesses 59 flu 58 asthma 57 respiratory diseases 57 bacterial infection 57 infection 57 gastroenteritis 56 H#N# virus 56 sore throat 56 flulike symptoms 56 chicken pox 55 bacterial meningitis 55 respiratory 54 chickenpox 54 flu virus 54 breathing difficulties 54 meningitis 54 fevers 54 tuberculosis 54 swine flu 53 mumps 53 symptoms 53 ear infection 53 whooping cough 52 H#N# 52 stomach bug 52 diarrhea 52 highly contagious 52 infections 52 pertussis 52 encephalitis 52 disease 52 H#N# influenza 51 dengue fever 51 norovirus 51 colds 51 upper respiratory 51 ailment 51 swine flu virus 51 superbug 51 strep throat 50 H#N# flu 50 measles 50 SARS 50 emphysema 50 ailments 49 appendicitis 49 MRSA 49 typhoid 49 virus 49 Lyme disease 49 mononucleosis 48 C. difficile 48 seasonal influenza 48 Severe Acute Respiratory Syndrome 48 coughs 48 allergies 47 H#N# strain 47 Influenza 47 asthmatic 47 lung cancer 47 botulism 47 jaundice 47 sickness 47 West Nile virus 46 COPD 46 air pollution 46 H#N# swine flu 46 viral infections 46 dengue 46 staph infection 46 poisoning 46 coughing 46 Flu 45 SARS virus 45 bacterial infections 45 DVT 45 fever 45 carbon monoxide poisoning 45 influenza virus 45 heat exhaustion 45 Swine flu 45 wheezing 45 kidney failure 45 asymptomatic 45 avian flu 45 RSV 45 allergic reactions 45 infectious diseases 45 staph 44 bird flu 44 Tuberculosis 44 cholera