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Across 3. the manner in which a pathogen enters a susceptible host. The portal of entry must provide access to tissues in which the pathogen can multiply or a toxin can act. 4. carried through air 5. the measures or steps taken for prevention of disease as opposed to disease treatment 6. 6 chain links: the infectious agent, reservoir, portal of exit, mode of transmission, portal of entry, and susceptible host. 8. organisms that are capable of producing infection or infectious disease. 9. the process of making something free from bacteria or other living microorganisms. 11. infections transmitted from an infected person to an uninfected person through sexual contact. STDs can be caused by bacteria, viruses, or parasites. 12. a strong heated container used for chemical reactions and other processes using high pressures and temperatures, 13. illnesses that spread from one person to another or from an animal to a person, or from a surface or a food. 14. the level of contact at which a person is not subject to contracting a communicable disease from another 16. infections that occur more often or are more severe in people with weakened immune systems than in people with healthy immune systems. 17. An infection that is in the bloodstream 19. caused by consuming contaminated foods or beverages. 20. any route that the pathogen can leave the reservoir. This depends entirely on the characteristics of the reservoir 21. Disease that results from an infection transmitted to humans and other animals by blood-feeding anthropods, such as mosquitoes, ticks, and fleas 22. organisms are bacteria that have become resistant to certain antibiotics 23. microorganisms that cause disease and are present in human blood.

Down 1. infectious agent, also called a pathogen, can be transferred from one person, object, or animal, to another. 2. clothing and equipment that is worn or used in order to provide protection against hazardous substances or environments. 7. a risk to human health or the environment arising from biological work, especially with microorganisms. 10. the habitat in which the agent normally lives, grows, and multiplies. 11. that will feel the effects of the infectious disease that has traveled through the chain of infection. 15. An infection that has not spread but remains contained near the entry site 18. healthcare-associated infections (HAI), are infections acquired during the process of receiving health care that was not present during the time of admission