infectious disease n.
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Infectious Disease

Infectious Disease

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Infectious Disease

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  1. Infectious Disease

  2. Bacteria: Friend or Enemy?


  4. Pathogens: Bacteria, viruses, parasites, and fungi, called pathogens are capable of causing a change that disrupts the homeostasis in the body. Any disease caused by the presence of pathogens in the body is called an infectious disease. The main sources of pathogens are soil, contaminated water, and infected animals, including other people

  5. Good Bacteria: Not all microorganisms are pathogenic; your body is host to billions of microorganisms, most of which are bacteria. These microorganisms have a symbiotic relationship with your body helping to keep harmful bacteria and other microorganisms from growing.

  6. Good Bacteria: If beneficial organisms are eliminated from your body, pathogens can establish themselves and cause infectious disease. In addition, if beneficial organisms enter areas of the body where they are not normally found, these formerly harmless organisms can become potential pathogens

  7. Common Diseases caused by Pathogens:

  8. Strep Throat:


  10. Carriers: Main source of human disease pathogens is the human body. People may or may not display symptoms of the illness. Animals are the other main reservoir for pathogens, making the eradication of certain pathogens almost impossible.


  12. Transmission Pathogens can be transmitted to a host from a reservoir four main ways; By direct contact; exchange of body fluid By an object; people handle contaminate objects then touch face, nose, eyes, etc… Through the air; person coughs or sneezes spreading droplets which are then inhaled By a vector; insects such as mosquitos, ticks spread pathogens between hosts or reservoirs

  13. Bats are carriers of rabies, an infectious disease:

  14. Mosquitoes carry many infectious diseases:

  15. Viruses: • Shape: multisided • Structure: contains DNA or RNA, no cytoplasm or organelles, • Composed of cells: no • Treatments: none, only preventions (antiviral, vaccines) • Not considered to be alive, must have a host cell; but destroys the cell

  16. Examples of diseases: flu, common cold (can mutate into different forms), viral meningitis, HIV-AIDS, polio, chicken pox Flu virus

  17. Bacteria: • Shapes: spheres, rods, spirals • Structure: single celled with a cell wall and and organelles but no nuclei • Composed of cells: yes • Treatments: antibiotics, Preventions-antibacterial, bacterial vaccines, antimicrobials • Found everywhere, can survive without a host, multiply rapidly and form colonies (100,000 = size of dime), can be helpful

  18. Examples of diseases: tetanus, anthrax, rabies, Lyme disease, bacterial meningitis Lyme Disease E Coli

  19. Fungi: • Shape: numerous • Structure: multi-cellular wit a cell wall and organelles including a nucleus, but no chloroplasts • Composed of cells: yes • Treatments: antifungals, antimicrobials • Cannot make their own food, grown on and feed off of organic matter; some kinds are beneficial, but others are harmful

  20. Examples of diseases: athlete’s foot, ringworm, yeast infections Athlete’s Foot Ringworm

  21. Parasites: • A parasite is an organism that lives on or in a host and gets its food from or at the expense of its host. • Parasites can cause disease in humans. Some parasitic diseases are easily treated and some are not. • Major types-protozoa, helminths or worms, and arthropods.

  22. Treatment: • antibiotics • prevention: drugs that can be taken as a barrier to certain parasites. improving sanitary conditions of water and food sources, proper cooking techniques, education about personal hygiene, and control of intermediate and vector host organisms.

  23. Protozoa • Single-celled organisms • More than 45,000 species of protozoa are known, many of which are parasitic. • Cause of more suffering and death than any other category of disease causing organisms. dysentary

  24. Helminths: • Wormlike organisms including nematodes (roundworms), cestodes (tapeworms), and trematodes (flukes). Leeches and heartworms are also helminths. tapeworm

  25. Arthropods: • Organisms characterized by exterior skeletons and segmented bodies. Examples include the crustaceans, insects, and arachnids. • Serve as carriers of bacterial and viral diseases, as intermediate hosts for protozoan and helminth parasites, and as parasites themselves. • Mosquitoes, flies, fleas, ticks, mites