Clinical Laboratory Microbiology: A Practical Approach - Central Nervous System

These flashcards cover the key concepts and facts from the lecture on clinical laboratory microbiology regarding the central nervous system, focusing on infectious diseases, their causes, symptoms, and lab diagnosis.

What is the primary objective of clinical laboratory microbiology regarding infectious diseases of the CNS?

To establish the source of microorganisms associated with infectious diseases of the central nervous system and assess their clinical significance in culture.

What are the key components of patient history data in relation to laboratory test results?

To correlate patient history data and laboratory testing results in order to propose infectious disease states and their associated causative agents.

What are the types of meningitis that should be differentiated based on laboratory testing results?

Acute, chronic, and aseptic meningitis.

What are the innate disadvantages of cerebrospinal fluid (CSF) in fighting infection?

Complement is absent, antibody levels are very low, and white blood cells are slow to appear.

What organism commonly caused acute meningitis in children before the introduction of vaccines?

Haemophilus influenzae, specifically capsular serotype b.

How is Neisseria meningitidis transmitted?

Passed person to person via respiratory secretions.

What characterizes the rash associated with Neisseria meningitidis infection?

Petechiae and purpura due to blood vessels bleeding under the skin.

What kind of meningitis is associated with Naegleria fowleri?

Acute meningitis, specifically primary amoebic encephalitis.

What are the laboratory findings typically associated with acute bacterial meningitis?

Increased white blood cell count, cloudy or turbid CSF, decreased glucose level, and increased protein level.

What is required for correct processing and analysis of CSF specimens?

Specimen must be processed immediately, with specific handling depending on tests being conducted.

What are the common outcomes of aseptic meningitis?

Most cases are self-limiting and resolve without complications.

What types of microorganisms are commonly associated with chronic meningitis?

Mycobacterium tuberculosis, Cryptococcus neoformans, and Treponema pallidum.

What is a significant risk factor for acute meningitis in relation to patient age?

Extremes in age render individuals more susceptible to infection.

What is the common causative agent of aseptic meningitis?

Viruses, such as enteroviruses and arboviruses.

What kind of formulation is used for detecting Cryptococcus neoformans?

India ink preparation.

What is the importance of choosing the correct media for isolating pathogens?

Appropriate media ensures effective isolation of pathogens from clinical samples.

What is the CSF WBC count for chronic meningitis?

Usually high but lower than that seen in acute meningitis.

What complication might arise from Neisseria meningitidis infection?

Rapid progression to death due to shock and multiple organ failure.

Which CSF findings may indicate viral aseptic meningitis?

Predominance of lymphocytes, normal to decreased glucose, and normal to elevated protein.

What should be suspected in individuals who experience seizures without a previous history?

Taenia solium infection associated with chronic meningitis.