Preventing DT Search

Almost every ecosystem on earth contains viruses. The word virus comes from Latin meaning “poison.” Some biologists consider viruses to be a life form, but most think of them as nonliving molecules that typically contain an RNA or DNA core of genetic material surrounded by protein.1 Viruses cannot self-replicate or reproduce outside a living host […]

Bacteria are one-cell living organisms that can be found both inside and outside the human body. They divide and multiply independently of a host and can thrive in almost any environment including on nonliving surfaces like plastic. Most bacteria are not harmful, and many bacteria are necessary for good health. The immune system relies on

In this chapter  (Types of Infectious Agents), you’ll encounter the terms shown here. Flip a card to review the term definition. Previewing terminology leads to better comprehension and memorization of content. At any time, you can return to this section of the course and review terminology. Antigens Proteins found on the surface of pathogens. Candida A common

Activity 1: Types of Diseases  Directions: Drag the correct word to the correct statement and then check your results. Use the best answer for each statement. Activity 2: True or False  Directions: Check your understanding of the content in Chapter 1 (An Overview of Disease) by answering these true or false questions correctly. How did

We already know that an infectious disease is a disease caused by a pathogen. A pathogen is a disease-causing microorganism such as a bacterium, virus, fungi, or parasite. We’ll talk about these pathogens in detail in Chapter 2 (Types of Infectious Agents). Some infectious diseases are communicable. Communicable diseases (also called contagious diseases) are infections

Earlier, noninfectious diseases where defined as conditions caused by something other than pathogens that are not contagious. Noninfectious diseases are more likely caused by immune system disorders, the development of abnormal cells, nutritional deficiencies, gene mutations, abnormal metabolic functions, or lifestyle factors. Many noninfectious diseases are chronic conditions that last for long periods or for

In the chapter introduction we defined disease as an infectious or noninfectious condition that causes changes in the appearance, structure, or function of cells, tissues, organs, or systems in the human body. These changes may be observable (signs) or subjectively experienced by the patient (symptoms). Diseases often, but not always, have a known cause. They

In this chapter (An Overview of Disease), you’ll encounter the terms shown here. Flip a card to review the term definition. Previewing terminology leads to better comprehension and memorization of content. At any time, you can return to this section of the course and review terminology. Acute Disease A disease with an abrupt onset, rapidly