Microbiology Exam 3 Terms and Definitions

Immunity and Antimicrobial Effects

• Natural Passive Immunity

  • Definition: This refers to the immediate but temporary protection an individual receives when pre-made antibodies are transferred through natural biological means.
  • Clarification: The speaker corrected a previous mention of "premade antibiotics" to clarify that these are pre-made antibodies.

• Nephrotoxin

  • Definition: A substance that is poisonous or damaging to the kidneys ($\text{renal system}$).
  • Application in Microbiology: It is used to describe antimicrobial agents, including specific antibiotics and antifungals, that possess the capacity to injure kidney cells.
  • Clinical Consequences: Exposure to nephrotoxins can potentially lead to acute kidney injury ($\text{AKI}$) or impaired waste filtration processes.

• Neutralization

  • General Definition: The chemical process of combining an acid and a base.
  • Goal: The combination continues until the substances reach a balanced proportion resulting in a $\text{pH}$ value close to $7$.

Defense Mechanisms and Infection Types

• Nonspecific Defenses (Innate Immunity)

  • Definition: These are the body's rapid, general defense mechanisms that provide protection against all pathogens.
  • Availability: These defenses are present and functional immediately at birth.
  • Characteristics: They do not target specific microbes and do not develop immunological memory.
  • Classification: They are divided into two main lines:
    1. The First Line of Defense: Consists of physical and chemical barriers.
    2. The Second Line of Defense: Consists of internal responses.

• Nonsociocomial Infections (Healthcare Associated Infections)

  • Definition: These are infections developed by patients after they have been admitted to a hospital.
  • Criteria: To be classified as such, the infection must have been neither present nor in the incubation period at the time of admission.
  • Source: They are primarily driven by opportunistic pathogens originating from the healthcare environment or the patient's own flora.
  • Complications: These infections often demonstrate severe antibiotic resistance.

• Opportunistic Pathogen

  • Definition: Microbes that are ordinarily nonpathogenic or only weakly pathogenic.
  • Pathogenesis: They cause disease primarily when the host is immunologically compromised.

• Secondary Infection

  • Definition: An infection that compounds a preexisting (primary) infection.
  • Timing: It manifests after one infection has already become active within the host.

Medical Science and Clinical Indicators

• Pathology

  • Definition: A broad branch of medical science dedicated to studying the causes, mechanisms, and nature of diseases.
  • Methodology: This study is conducted through the examination of bodily fluids and tissues.

• Prevalence

  • Definition: The total number of cases of a specific disease identified within a certain geographical area and time period.

• Rubor

  • Definition: The Latin term for redness.
  • Context: It represents one of the $5$ cardinal signs of inflammation.
  • Significance: It serves as a visual indicator that the immune system is actively responding to a microbial infection, injury, or irritant.

Cellular and Biochemical Terms

• Opsonization

  • Definition: The process of stimulating phagocytosis by affixing specific molecules to the surface of foreign particles or cells.
  • Molecules involved: These molecules, referred to by the speaker as "operons," include antibodies and "completement."

• Penicillinase

  • Definition: An enzyme that possesses the ability to hydrolyze penicillin.
  • Occurrence: It is found in penicillin-resistant bacterial strains.

• Plasma Cells

  • Synonyms: Plasmacytes or Plasma B cells.
  • Function: Specialized white blood cells that serve as the "antibody factories" of the immune system.
  • Origin: They develop from activated B lymphocytes.
  • Action: They produce large volumes of specific antibodies designed to neutralize foreign pathogens, such as viruses and bacteria.

Pathogens and Treatments

• Pandemic

  • Definition: A disease that inflicts an increased proportion of the population across a wide geographic area.
  • Scope: This typically spans across multiple continents and is often worldwide.

• Probiotics

  • Definition: Preparations containing live microbes.
  • Usage: Administered as a therapeutic or preventative measure to compete with or displace potential pathogens.

• Prophylactic

  • Definition: Refers to any treatment, medication, or measure used primarily for prevention.
  • Focus: The goal is to prevent a disease or infection from occurring initially rather than treating an infection that is already active.

• Prion

  • Note: The speaker describes these as exogenous or endogenous substances that can cause a fever in humans and animals.

• Pyogenic

  • Definition: Pertains to pus formers.
  • Example: Pyogenic cocci.

• RES (Reticulonew Reticulo Neodocele System)

  • Alternate Name: Mononuclear phagocyte system ($\text{NPS}$).
  • Definition: A collection of macrophages and monocytes scattered throughout extracellular spaces.
  • Function: To degrade or engulf foreign molecules.

• Reservoirs

  • Definition: In the context of disease communication, this is the natural habitat or natural host for a pathogen.

• Resident Bacteria

  • Synonyms: Microbiome or normal flora.
  • Definition: Microorganisms that are permanent and harmless colonizers of specific sites inside or on the human body, such as the gut and the skin.