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I thought this was a very intriguing image to use to look into the different facets of evolution. This representation encapsulates the concept of evolution by combining biological, historical, and scientific themes into one cohesive visual.

1. The DNA strand symbolizes the genetic basis of evolution. Mutations and variations are essential to the evolutionary process.

2. The progression from a monkey to a caveman and then to a modern human climbing the helix illustrates the idea of evolutionary advancement and the development of species over time. The placement of modern humans at the top of the helix implies the current state of human evolution, while earlier forms are shown lower on the ladder, reflects the historical progression.

3. The inclusion of monkeys and early humans depicts the evolutionary lineage leading to modern humans, highlighting the connection between species over millions of years.

4. The background includes diagrams, formulas, and the words "Advantages Evolution," suggesting a scientific approach to understanding evolution.

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Streptococcus pneumoniae is a gram-positive bacterium and a significant cause of community-acquired pneumonia (CAP). Before antibiotics, it accounted for 95% of pneumonia cases and still causes 15% of cases in the U.S. and 27% worldwide. Discovered by Louis Pasteur in 1881, this facultative anaerobe owes its virulence to its polysaccharide capsule, which protects it from the immune system.

With 92 identified serotypes, S. pneumoniae is commonly found colonizing the nasopharynx of healthy individuals, especially during colder seasons. Its ability to persist in healthy carriers and cause infections underscores its global impact as a key pathogen. It goes over different treatment and management options for individuals diagnosed with this type of pneumonia. Stressing the importance of cooperation among the interprofessional team in educating patients on the advantages and disadvantages of blood cultures, and compliance with antibiotics to enhance the delivery of care. It also provides complications the individual may have if left untreated or not correctly managed. Overall, this article highlights the background and most important information on streptococcus pneumoniae.

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Continuing Education Activity

Streptococcus pneumoniae is a gram-positive, lancet-shaped bacterium and a cause of community-acquired pneumonia. Pneumococcal infections are present throughout the world and are most prevalent during the winter and early spring months. This activity outlines the evaluation and treatment of Streptococcus pneumonia infections and reviews the role of interprofessional team members in improving care for those with this condition.

Objectives:

Describe the pathophysiology of streptococcus pneumonia.

Review the history and physical exam of a patient with streptococcal pneumonia.

Summarize the treatment options for streptococcal pneumonia.

Explain the importance of cooperation among the interprofessional team in educating patients on the advantages and disadvantages of blood cultures, and compliance with antibiotics to enhance the delivery of care of those with Streptococcus pneumoniae.

Access free multiple choice questions on this topic.
Introduction

Community-acquired pneumonia (CAP) is the seventh leading cause of death in the United States, and the cost of these hospitalizations is estimated to cost up to $9 billion in the United States (US) dollars each year. Thirty-day hospital mortality associated with CAP has been estimated to be as high as 22% and is the leading cause of death amongst all infectious diseases.

Streptococcus pneumoniae is the bacterium that has historically been the most common pathogen to cause CAP worldwide. In the era before antibiotics, S. pneumoniae was estimated to be the cause of 95% of all cases of pneumonia. Currently, however, S. pneumoniae accounts for up to 15% of pneumonia cases in the United States and 27% of cases worldwide today. Blood cultures are positive in only 20% to 25% of all pneumonia cases that are caused by S. pneumonia making it a challenging diagnosis for the clinician.[1][2][3]

Etiology

S. pneumonia was first isolated from the saliva of a patient with rabies in 1881 by Louis Pasteur and the association between lobar pneumonia, and Friedlander and Talamon first reported the bacteria in 1883. Although vaccination efforts were underway as early as 1911, the first pneumococcal vaccine was not produced in the United States until 1977 and the first conjugate vaccine in 2000.[4][5]

S. pneumonia is a lancet-shaped, gram-positive, facultative anaerobic organism that typically occurs in pairs or short chains. Encapsulated S. pneumonia is pathogenic for humans, and the capsular polysaccharide is the basis for which the organism is classified. As of 2011, a total of 92 separate serotypes have been isolated.

Epidemiology

Pneumococcal infections are present throughout the world and are most common during the winter and early spring months. IS. pneumoniae is prevalent in large part due to its colonizing ability in the nasopharynx. Almost 40%-50% healthy children and 20%-30% of healthy adults are carriers.[6] With childhood conjugate vaccination for Streptococcus pneumoniae, the colonization frequency has decreased.

Although S. pneumoniae pneumonia can occur in all populations, it is more common in patients older than 65 years, younger than 2 years, those who smoke, abuse alcohol, have asthma or COPD, or are asplenic. The overall rate of confirmed S. pneumoniae infection in the United States is 5.16 to 6.11 cases/100,000 in adults with the rate for those older than 65 years being 36.4/100,000 and infants younger than 1 year being 34.2/100,000.[7][8][9] World Health Organization estimated that 1.6 million deaths in 2005 including 1 million children less than 5 years of age, occurred due to streptococcus pneumoniae. It is a common co-infection in influenza patients and affects the morbidity and mortality in such patients.

Pathophysiology

Infection typically occurs after the colonization of the oropharynx and nasopharynx of healthy individuals. Inhalation of these colonies causes the infection of the lower airways. Infection, typically will not result unless a patient has predisposed risk factors, a bolus of infectious cells or due to a particularly virulent strain of S. pneumoniae.

The capsule plays a major role in the pathogenesis of Streptococcus pneumoniae. It is made up of polysaccharides and surrounds the cell wall. It helps in escaping phagocytosis by preventing the access of granulocytes to the underlying cell wall. These polysaccharides of the capsule help in the identification and serotyping of the bacteria. Many serotypes have been detected, 6, 14, 18, 19 and 23 are the most common ones causing the infection. On culture media, the virulence of these strains can be identified by their appearance, opaque and transparent types. Transparent type usually colonizes in nasopharynx while the opaque type is present in the lung, brain and bloodstream infection.

The second important characteristic of the pathogenicity of Streptococcus pneumoniae is its ability to adhere to the respiratory epithelium and invasion.

The severity of the pneumococcal disease is due to significant inflammatory response induced by the activation of complement pathways and cytokine release by cell wall proteins, autolysin, the capsular polysaccharides and DNA released by bacterial end products.

Toxicokinetics

S. pneumonia has several virulence factors that allow it to cause infections in humans. A polysaccharide capsule interferes with phagocytosis by inhibiting the binding of complement C3b to the cell's surface. Pneumococcal proteins also play a large role in the virulence of the bacteria. IgA1 protease interferes with host defense at mucosal surfaces, and neuraminidase prevents the attachment to epithelial cells. Other proteins that act in the virulence of S. pneumonia include pneumolysin, pneumococcal surface protein A, and autolysin. Lastly, pili allow for the adherence of the organism to cellular surfaces and play a role in host inflammation.

Over the last several years, drug-resistant S. pneumonia (DRSP) and penicillin-resistant S. pneumonia have become more common. Penicillin resistance is the result of alterations in the penicillin-binding protein (PBP) and affects the binding penicillin but not that of all the beta-lactams. DRSP is the result of genetic mutations that can either cause an active efflux of the drug out of the cell or block it from binding. Those at risk of DRSP include the extremes of age, recent antimicrobial therapy, either attending daycare or having a family member who attends daycare, having multiple co-morbid conditions, or being recently hospitalized.

History and Physical

Those with pneumonia may present with a wide array of symptoms, but the most common include dyspnea, cough, pleuritic pain, sputum production, and fever. However, in many studies, these symptoms have been found to neither are sensitive or specific for the diagnosis of pneumonia. In the elderly, the clinical presentation may not follow typical patterns, leading to delay in diagnosis and increased mortality. In the elderly symptoms such as generalized weakness, altered mental status and malaise could be the first signs of the illness.

A patient's vital signs may be the most useful physical exam finding in diagnosing those with pneumonia. When tachypnea, hypoxia, or hyperthermia is present in a patient whose pneumonia is suspected, further diagnostic evaluation should be undertaken. Classical signs of consolidation such as egophony, rales, whispered pectoriloquy, dullness to percussion or bronchial breath sounds might be heard. However, multiple studies have shown that physical exam findings lack both sensitivity and inter-observer reliability in regards to diagnosing pneumonia.

Evaluation

Routine laboratory evaluation does not aid in diagnosing the organism causing pneumonia but may allow for better risk stratification of patients.[10][11]

Chest radiography has been considered to be the mainstay in diagnosing pneumonia. Classically lobar pneumonia has been taught to be caused by S. pneumonia. However new literature has shown that a radiograph is not reliable in determining the causative organism in pneumonia patients. Unfortunately, radiographs are not 100% sensitive in diagnosing pneumonia. Computed tomography (CT) has shown to have better sensitivity and accuracy as compared to plain chest radiography to diagnose CAP but is used limitedly because of a relatively high cost and radiation exposure.

The diagnosis of the causative organism for pneumonia can be obtained through a variety of means including blood cultures, sputum analysis, and urinary antigens. The routine collection of blood cultures has been controversial in the literature. Recently the Centers for Medicaid and Medicare Services and the Joint Commission on Accreditation of Healthcare Organizations have noted that routine collection of blood cultures is no longer a core measure that is being tracked. Also, the American College of Emergency Physicians (ACEP) made a grade B recommendation against the routine collection of blood cultures in patients admitted with CAP. Further sources note that blood cultures should be obtained in those admitted to the intensive care unit, those with leukopenia, cavitary lesion, severe liver disease, alcohol abuse, asplenia or pleural effusions. When blood cultures are positive, the majority show S. pneumonia but rarely change clinical management.

Sputum cultures typically have had low sensitivity and specificity in detecting the causative organism for pneumonia. However, in those patients suspected of having a drug-resistant organism, sputum cultures should be obtained.

A urinary antigen does exist to aid the clinician in diagnosing cases of S. pneumonia and carries a sensitivity of 80% and a specificity of 97%. However, the usefulness in children is debatable due to many children being carriers of S. pneumonia.

Treatment / Management

The mainstay of treatment for patients with S. pneumonia is antibiotic therapy and supportive care including mechanical ventilation if necessary. Treatment of CAP varies based on the area of practice and severity of the disease. Patients with low-risk CAP are typically treated as an outpatient with macrolide monotherapy. Respiratory fluoroquinolones are used in outpatient patients at higher risk. Non-ICU inpatients are treated with a dual therapy of a b-lactam plus a macrolide or respiratory fluoroquinolone monotherapy. Patients admitted to the ICU should be treated with a dual therapy of either a b-lactam plus a macrolide or a b-lactam plus respiratory fluoroquinolone. A recent Cochrane review shows the non-superiority of any outpatient antibiotic regimen for CAP concerning the other drug classes.[12][13][14]

The first dose of antibiotics should be given as quickly as possible after the definitive diagnosis. The ACEP policy statement gives a level B recommendation that there is not enough evidence to establish a benefit in mortality or morbidity from starting the antibiotics in less than 4, 6, or 8 hours. The ACEP clinical policy also notes that there is not enough evidence to determine if there is a benefit in morbidity or mortality from antibiotics being administered within any specific time course but recommends to begin antibiotics as soon as the diagnosis is made. Patients with complicated pneumonia having parapneumonic effusion may need a tube thoracostomy and if it further progresses to empyema and is resistant to drainage by tube thoracostomy then decortication is required with video-assisted thoracoscopic surgery (VATS).

Differential Diagnosis

There are no specific signs and symptoms for pneumococcal pneumonia so whenever the diagnosis of pneumococcal pneumonia is considered following differentials should be kept in mind.

Complications

Pneumococcal pneumonia, if not treated by appropriate antibiotics at an appropriate time or caused by a more virulent/resistant strains, can lead to the following complications.

Consultations

Infectious disease consultant

May need an Intensive care physician in severe cases

Deterrence and Patient Education

Universal childhood immunization with a conjugate pneumococcal vaccine should be done. All individuals who are at increased risk of acquiring pneumococcal infection like old age people more than 65 years old, patients with underlying lung disease, alcoholics, with chronic kidney and liver diseases, who are undergoing splenectomy or have functional asplenia should be vaccinated.

Cigarette smoking has been found to increase the risk of pneumococcal infection in otherwise healthy people. Therefore smoking cessation should be encouraged. Good nutrition, healthy environment and avoidance of daycare attendance decrease the frequency of acquiring the infection.

Pearls and Other Issues

There are two vaccines commonly used for S. pneumoniae. The pneumococcal polysaccharide vaccine, PPSV23, and the pneumococcal conjugate vaccine, PCV13. In immunocompetent individuals, five doses of PCV13 are recommended during infancy and childhood. A repeat dose of PCV13 at age 65 is recommended followed by a dose of PSV23 one year later. In randomized control trials, PCV13 was shown to prevent the first episode of vaccine-serotype pneumococcal pneumonia. Although these vaccines have made great strides in decreasing S. pneumoniae pneumonia, there a number of serotypes not included in these vaccines. Although between the two vaccines the most prevalent serotypes are covered, there are approximately 90 serotypes in total and the vaccine will not foster immunity in all serotypes. Finally, it has been shown that influenza vaccination has a strong association with better outcomes and a decreased rate of pneumonia.

Enhancing Healthcare Team Outcomes

Streptococcal pneumonia is best managed with an interprofessional team that includes a pulmonologist, an infectious disease expert, an ICU nurse, a pharmacist, a respiratory therapist, and a dietitian. Patients need to be educated on the importance of vaccination and its benefits. In addition, patients should be advised to stop smoking and remain compliant with antibiotics. Since many patients with pneumonia are frail, a dietary consult should be sought to help improve the calorie intake. Others may need rehabilitation to restore muscle mass and increase exercise endurance. [15][16](Level V)

Outcomes

The prognosis for patients with streptococcal pneumonia depends on the underlying risk factors, comorbidity, age, the extent of lung involvement, the need for mechanical ventilation and the type of antibiotic. Overall, the pneumonia is associated with high morbidity and mortality. Even those who survive tend to have residual deficits in lung mechanics and recovery is prolonged. Patients in the ICU tend to have the highest mortality approaching 3-20%. [1][17](level V)

References

Disclosure: Christopher Dion declares no relevant financial relationships with ineligible companies.

Disclosure: John Ashurst declares no relevant financial relationships with ineligible companies.

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Community-acquired pneumonia (CAP) is the seventh leading cause of death in the United States, and the cost of these hospitalizations is estimated to cost up to $9 billion in the United States (US) dollars each year. Thirty-day hospital mortality associated with CAP has been estimated to be as high as 22% and is the leading cause of death amongst all infectious diseases.

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Plants we encounter daily are a mix of both monocots and dicots. Monocots tend to dominate in grassy areas, parks, and tropical landscapes. Think lawns, palm trees, corn, and ornamental flowers like lilies. Dicots are more common in gardens, forests, and as many of the fruits and vegetables we eat. Think shrubs, trees like maples and oaks, sunflowers, tomatoes, beans, and roses. Generally, most trees, flowering plants, and crops tend to be dicots, while grasses, cereal crops, and certain flowering plants are monocots.

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Starfish, sea cucumbers, and sea urchins are all echinoderms, sharing key traits despite their differences. They are marine-only invertebrates (no backbone) with radial symmetry. This means their bodies can be divided into five identical parts, unlike humans, who have bilateral symmetry. They begin bilaterally symmetrical until "adulthood". Their water vascular system, featuring tube feet, aids in movement, feeding, breathing, and sticking to surfaces.

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What Are Echinoderms? | Learn all about the phylum of starfish, sea urchins, and sea cucumbers!

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This website defines homeostasis, how it is maintained, the types and how it impacts your body. The author Kendra Cherry, MSEd, also mentions how the term ‘homeostasis’ was “first coined by a physiologist named Walter Cannon in 1926.” The primary components of how homeostasis works: stimulus > receptor > control unit > effector. The site also goes over negative feedback loop and positive feedback loop that are used to get the body back to homeostatic state. Negative feedback being where the stimulus is being decreased and positive being where it is increased. Negative feedback is the most common of the two. While the type of homeostasis are thermoregulation, osmoregulation, and chemical regulation. The impact of homeostasis being how your internal systems react to outside sources. I found the article to be well explained, but still short and to the point.

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How Homeostasis Maintains the Body’s Equilibrium

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Homeostasis is the process that allows the body to reach and maintain a state of equilibrium. Learn more about how homeostasis works.

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The article explores the lived experiences of individuals undergoing hemodialysis for kidney failure, highlighting the significant impact on their physical, emotional, social, and practical well-being. Many patients struggle with feelings of dependence on the dialysis machine, leading to frustration, loss of autonomy, and a diminished sense of self. The review identifies numerous unmet supportive care needs, including better psychological support, improved patient-clinician communication, and more accessible health information. Social relationships and intimacy are also affected, often leading to isolation and emotional distress. Additionally, practical challenges such as financial strain, transportation difficulties, and employment concerns add to the burden. Family members and caregivers also experience stress in their supportive roles. The study emphasizes the necessity of moving away from a standardized approach to hemodialysis care and instead adopting a more personalized, patient-centered model that addresses the holistic needs of individuals living with kidney failure.

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The Arctic biome is a unique and extreme environment characterized by the following features:

1. Climate: The Arctic has long, harsh winters with temperatures often dropping below -60°F and short, cool summers. Precipitation is low, mostly in the form of snow.

2. Permafrost: Much of the Arctic is covered by permafrost, a layer of permanently frozen soil that affects plant growth and water drainage.

3. Vegetation: Due to the cold climate and short growing season, vegetation is limited to low-growing plants like mosses, lichens, grasses, and small shrubs.

4. Wildlife: The Arctic supports a variety of animals adapted to extreme cold, such as polar bears, arctic foxes, reindeer (caribou), wolves, and seals. Many birds migrate to the region in the summer.

5. Northern Lights: The Arctic is one of the best places to see the aurora borealis, a natural light display caused by charged particles from the sun interacting with Earth’s atmosphere.

6. Ice and Water: Large portions of the Arctic are covered by ice sheets, glaciers, and frozen seas. However, with climate change, ice cover is decreasing, impacting ecosystems.

7. Human Presence: Indigenous peoples, such as the Inuit and Sami, have adapted to the Arctic for centuries, using traditional knowledge and skills to survive in the harsh conditions.

8. Daylight Variations: The Arctic experiences extreme daylight variations, with 24-hour daylight (Midnight Sun) in summer and months of darkness in winter (Polar Night).

The Arctic biome is a harsh yet stunningly beautiful environment, home to unique wildlife, resilient vegetation, and breathtaking natural phenomena like the northern lights. Despite its extreme cold and long winters, life has adapted in remarkable ways. However, climate change poses significant threats to this fragile ecosystem, making conservation efforts more important than ever.

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The term 'biodiversity' was first coined by Walter Rosen in 1985. Biodiversity is the variety of all living things on Earth, including plants, animals, fungi, and microorganisms. It also includes the different ecosystems they live in, like forests, oceans, and deserts. No species is exactly the same. An example of species diversity is the Great Barrier Reef in Australia, it is home to over 9,000 species. High biodiversity means a healthy, balanced environment where different species support each other. It helps provide food, clean air, medicine, and a stable climate. However, human activities like deforestation and pollution are reducing biodiversity, which can harm the planet and our way of life. Protecting biodiversity is important for a healthy and sustainable future.

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What Is Biodiversity? - Definition, Types And Importance - Biological diversity - Learning Junction