Which of the following is NOT considered a pathogen? A. hookworm B. cancer C. me

Question

Which of the following is NOT considered a pathogen? A. hookworm B. cancer C. meningococcus bacterium D. chicken pox virus E. athlete's foot fungus A sample of tissue from an injury shows a large number of eosinophils. This would indicate that the tissue was A. infected by viruses B. inflamed. C. abscessed. D. being rejected. E. infected by multicellular parasites. When a person is afflicted with acquired immunodeficiency syndrome (AIDS), helper T cells are killed and reduce in number. As a result, infected people are more susceptible to illnesses that would otherwise not occur in a healthy immune system. The pathophysiology associated with AIDS is/are an example of a/an response by the immune system. A. incorrect B. lack of C. overactive D. none of the above

Explanation / Answer

A pathogen is an infectious agent like bacteria, virus, protozoa, fungus or a prion that cause diseases. Hookworm, meningococcus bacterium, chicken pox virus, athelet’s foot fungus are all pathogens that cause diseases. On the other hand, cancer is an abnormal growth of cells and the cancer cells have the potential to invade other cells of the body. So, the correct option is option B, cancer. Eosinophils are a type of white blood cells that play a role in the body’s immune response to allergic reactions, asthma. They also provide immunity against parasitic infections. So, the correct option is option E, infected by multicellular parasites. AIDS is caused by human immunodeficiency virus. The virus infects T cells (T-helper cells). As a result these T-cells are killed and their cell numbers decline due to HIV infection. People with AIDS are more susceptible to opportunistic infections that would otherwise not occur in a healthy immune system. This is due to impaired or incorrect immune response by the immune system. So, the correct option is option A, incorrect.

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