science

Neisseria gonorrhoeae

Neisseria gonorrhoeae is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Neisseria gonorrhoeae rather than just read about it. In short: Neisseria gonorrhoeae, also known as gonococcus (singular) or gonococci (plural), is a species of Gram-negative diplococci bacteria first isolated by Albert Neisser in 1879. An obligate human pathogen, it primarily colonizes the mucosal lining of the urogenital tract; however, it is also capable of adhering to the mucosa of the nose, pharynx, rectum, and conjunctiva.

Key takeaways

Neisseria gonorrhoeae belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Neisseria gonorrhoeae to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Neisseria gonorrhoeae from memory before moving on to harder problems.

Reference excerpt

Neisseria gonorrhoeae, also known as gonococcus (singular) or gonococci (plural), is a species of Gram-negative diplococci bacteria first isolated by Albert Neisser in 1879. An obligate human pathogen, it primarily colonizes the mucosal lining of the urogenital tract; however, it is also capable of adhering to the mucosa of the nose, pharynx, rectum, and conjunctiva. It causes the sexually transmitted genitourinary infection gonorrhea as well as other forms of gonococcal disease including disseminated gonococcemia, septic arthritis, and gonococcal ophthalmia neonatorum. N. gonorrhoeae is oxidase positive and a microaerophile that is capable of surviving phagocytosis and growing inside neutrophils. Culturing it requires carbon dioxide supplementation and enriched agar (chocolate agar) with various antibiotics (Thayer–Martin). It exhibits antigenic variation through genetic recombination of its pili and surface proteins that interact with the immune system. Sexual transmission is through vaginal, anal, or oral sex. Sexual transmission may be prevented through the use of barrier protection. Perinatal transmission may occur during childbirth, though it is preventable through antibiotic treatment of the mother before birth and application of antibiotic eye gel on the eyes of the newborn. Gonococcal infections do not result in protective immunity; therefore, individuals may be infected multiple times. Reinfection is possible due to N. gonorrhoeae's ability to evade the immune system by varying its surface proteins. Asymptomatic infection is common in both males and females. Untreated infection may spread to the rest of the body (disseminated gonorrhea infection), especially the joints (septic arthritis). Untreated infection in women may cause pelvic inflammatory disease and possible infertility due to the resulting scarring. Gonorrhoea is diagnosed through cultures, Gram staining, or nucleic acid tests (i.e. polymerase chain reaction) of urine samples, urethral swabs, or cervical swabs. Chlamydia co-testing and testing for other STIs is recommended due to high rates of co-infection. Antibiotic resistance in N. gonorrhoeae is a growing public health concern, especially given its propensity to develop resistance easily. This ability of N. gonorrhoeae to rapidly adapt to novel antimicrobial treatments has been seen several times since the 1930s, making numerous treatment plans obsolete. Some strains have exhibited resistance to the current ceftriaxone treatments.

Microbiology

Neisseria species are fastidious, Gram-negative cocci (though some species are rod-shaped and occur in pairs or short chains) that require nutrient supplementation to grow in laboratory cultures. They are facultative intracellular pathogens, meaning they can persist and colonize within host cells but can also multiply outside the host cellular environment. They typically appear in pairs (diplococci), resembling the shape of coffee beans. Members of this genus do not form endospores and are nonmotile, except for pathogenic species, which are capable of moving using twitching motility; most are also obligate aerobes. Of the 17 species that colonize humans, only two are pathogenic: N. gonorrhoeae, which causes gonorrhea, and N. meningitidis, a leading cause of bacterial meningitis.

Culture and identification

N. gonorrhoeae can be isolated on Thayer–Martin agar (or VPN) agar in an atmosphere enriched with 3-7% carbon dioxide. Thayer–Martin agar is a chocolate agar plate (heated blood agar) containing nutrients and antimicrobials (vancomycin, colistin, nystatin, and trimethoprim). This agar preparation facilitates the growth of Neisseria species while inhibiting the growth of contaminating bacteria and fungi. Martin Lewis and New York City agar are other types of selective chocolate agar commonly used for Neisseria growth. N. gonorrhoeae is oxidase positive (possessing cytochrome c oxidase) and catalase positive (able to convert hydrogen peroxide to oxygen). When incubated with the carbohydrates lactose, maltose, sucrose, and glucose, N. gonorrhoeae will oxidize only the glucose.

Metabolism

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Neisseria gonorrhoeae

Start with the simplest possible case. Write down what Neisseria gonorrhoeae claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Neisseria gonorrhoeae before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Neisseria gonorrhoeae ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Neisseria gonorrhoeae

In research: Neisseria gonorrhoeae appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Neisseria gonorrhoeae in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Neisseria gonorrhoeae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bacteria described in 1885, Gonorrhea, Gram-negative bacteria, so understanding it makes those chapters shorter.
In everyday life: Look for Neisseria gonorrhoeae outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Neisseria gonorrhoeae in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Neisseria gonorrhoeae means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Neisseria gonorrhoeae out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Neisseria gonorrhoeae in simple terms?

Why does Neisseria gonorrhoeae matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Neisseria gonorrhoeae?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Neisseria gonorrhoeae.