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Across 2. infectious disease once occured, greatly declined, then increased 5. parasitic microorganisms 6. plant like organisms that live on dead organic matter 7. smallest microorganisms 9. the most effective way to prevent the spread of infection 10. found in decayed materials and contaminated water

Down 1. produces immunity; completely eliminate a pathogen 3. infectious disease have occured previously but affect small numbers 4. study of diseases in a population 8. precautions used for all patients