Review of Gram-Negative Bacteria

These flashcards cover key concepts about gram-negative bacteria, their impact, transmission methods, inflammation types, and diseases related to one of the major pathogens, Helicobacter pylori, as well as cholera and other infections.

What type of pathogens do the gram-negative bacteria discussed target?

They are primary pathogens, affecting healthy individuals without waiting for opportunities.

What is Helicobacter pylori?

A spiral shaped bacterium affecting up to 50% of the population, leading to gastritis and ulcers.

How is H. pylori transmitted?

Through saliva, feces, vomit, and contaminated food or water.

What environments can H. pylori survive in?

It survives in acidic environments due to urease activity, which neutralizes stomach acid.

What are the consequences of H. pylori infection?

It can lead to gastritis, ulcers, and tissue damage in the stomach.

What role does urease play in H. pylori survival?

Urease converts urea into ammonia, creating a basic environment around the bacteria.

What cells dominate acute inflammation?

Neutrophils dominate during acute inflammation.

What is the outcome of chronic inflammation?

Persistent infection, ongoing tissue damage, and potential disease development.

What lifestyle choices contribute to chronic inflammation?

Poor diet, lack of exercise, and chronic stress.

How can chronic inflammation be prevented?

By eating a healthy diet, exercising, managing stress, and prioritizing sleep.

What is gastritis?

Chronic inflammation of the stomach lining that may not always cause symptoms.

How does H. pylori cause gastritis?

By attaching to the mucus membrane and activating a chronic inflammatory response.

What is Vibrio cholerae?

A comma-shaped bacterium found in contaminated water that can cause cholera.

What are the symptoms of cholera?

Severe, acute, large-volume, watery diarrhea.

How does cholera toxin affect the body?

It interferes with the absorption of water in the small intestine.

What type of treatment is needed for cholera?

Fluid replacement and antibiotics.

What is Chlamydia trachomatis?

A bacterium that causes a common sexually transmitted infection.

Why is Chlamydia often unnoticed in infections?

Because ¾ of infected women and ½ of infected men are asymptomatic.

What are the two developmental forms of Chlamydia trachomatis?

Elementary body (EB) and reticulate body (RB).

What is unique about Mycoplasma pneumoniae?

It lacks a cell wall and causes upper respiratory infections.

What is the method of transmission for Mycoplasma pneumoniae?

From person to person via respiratory droplets.

How does Mycoplasma pneumoniae affect respiratory cells?

It damages and destroys cilia in respiratory epithelial cells.

What motion do spirochetes exhibit?

Corkscrew motion, allowing them to penetrate thick tissues.

What disease does Treponema pallidum cause?

Syphilis.

What disease is caused by Borrelia burgdorferi?

Lyme disease.

What is the role of bacterial adhesins in H. pylori infection?

They help the bacterium bind to host cell receptors for colonization.

What is the primary response during acute inflammation?

Elimination of the pathogen and tissue repair.

What is the duration of acute inflammation?

Minutes to days.

What immune cells are involved in chronic inflammation?

Macrophages and lymphocytes.

What is a common symptom of gastritis?

Gnawing or burning ache in the upper belly.

How does chronic inflammation relate to cancer risk?

Persistent damage can lead to disease development, including cancer.

What does 'asymptomatic' mean in the context of Chlamydia infection?

Shows no symptoms despite being infected.

Why are antibiotics used for Mycoplasma pneumoniae infections?

To treat respiratory infections effectively.

What is the significance of the curved shape of Vibrio cholerae?

It helps in its motility and adaptability to its environment.

What is the function of fimbrae in cholera?

To attach to the intestinal lining.

What are cytokines?

Proteins released by cells that signal immune responses.

What impact does stress have on chronic inflammation?

It increases cortisol levels, which can worsen inflammation.

What happens during the metabolic activity of Reticulate Bodies in Chlamydia?

They utilize host energy sources to form new elementary bodies.

What is the primary issue that leads to conditions like gastritis?

Chronic inflammation caused by infections or irritants.

What can excessive alcohol use lead to in the context of H. pylori?

It can exacerbate gastritis and other related conditions.

What is the typical treatment for a cholera infection?

Fluid replacement and potentially antibiotics.

How do lifestyle choices affect chronic inflammation?

Poor choices can lead to immune activation and tissue stress.

What does antibiotic treatment aim to do for infections caused by Mycoplasma pneumoniae?

Reduce infection and associated symptoms.

What is required for the cholera toxin to exert its effects?

Bacterial attachment to intestinal cells.

What is the primary characteristic of Treponema pallidum?

It is a spirochete responsible for causing syphilis.

How does H. pylori evade stomach acid?

By forming a cloud of ammonia that neutralizes the acid around it.

What are common symptoms of Chlamydia infections?

If symptoms appear, they usually are genital pain or discomfort.

What is the primary danger of untreated cholera?

Severe dehydration due to fluid loss.

What distinguishes chronic inflammation from acute inflammation?

Chronic inflammation is long-lasting and may lead to ongoing tissue damage.

How does exercise impact chronic inflammation?

Regular physical activity helps reduce inflammation.

What is the role of neutrophils in acute inflammation?

They help eliminate pathogens and begin the healing process.

What is the primary mechanism by which H. pylori causes ulcers?

Through tissue damage from inflammation and toxic secretion.

What is meant by 'cell wall-less' bacteria?

Bacteria, like Mycoplasma pneumoniae, that lack a rigid cell wall.

How can someone reduce the risk of infections caused by H. pylori?

By ensuring safe food and water practices.

What signifies a high mortality rate in cholera?

Delay in treatment and severe dehydration.

How many liters of fluid can be lost during a cholera infection?

Up to 20 liters if untreated.

What symptoms can indicate a severe case of cholera?

Severe watery diarrhea and dehydration.

How can the immune system perpetual activation lead to chronic conditions?

Continuous immune response without resolution can cause ongoing damage.

What protective mechanism does H. pylori use against stomach acidity?

Neutralizing the acidity with ammonia.

What are the results of chronic inflammation that lasts for years?

Ongoing tissue damage and risk of chronic diseases.

What evolutionary advantage do spirochetes hold?

Their motility allows them to navigate through tissues.

How do H. pylori infections typically progress if untreated?

They can lead to chronic conditions like ulcers.

What is the relationship between cortisol and inflammation?

High levels of cortisol can exacerbate inflammation.

What effect do dietary choices have on inflammation levels?

Healthy diets can lower inflammation.

Why are chronic health issues often linked to lifestyle?

Lifestyle choices directly impact inflammatory processes.

What is the primary focus of treating infections caused by Chlamydia?

Early detection and antibiotic treatment.

How do H. pylori infections typically present in asymptomatic individuals?

They may cause internal damage without noticeable symptoms.

What impacts do aging and chronic alcohol consumption have on gastritis?

Increased risk and severity of gastric inflammation.

What challenges does Vibrio cholerae present in low sanitation areas?

It persists and spreads through contaminated water.

What role do Macrophages have in chronic inflammation?

They participate in ongoing immune responses and tissue damage.

How do environmental factors contribute to cholera outbreaks?

Natural disasters and poor sanitation elevate risks.

What prevention strategies can mitigate the risk of cholera?

Improving water sanitation and hygiene practices.

What cellular response occurs with the presence of irritating ammonia from H. pylori?

Inflammation from immune cell recruitment.

How can early detection of STIs like Chlamydia benefit treatment?

It can prevent complications and further transmission.

What types of water loss can cholera cause in patients?

Large volumes of watery diarrhea leading to dehydration.