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Pathology - Bacterial pneumonia
Definition: An infection of the lung parenchyma induced by bacterial pathogens.
Classification • Acquired inside the community. • Nosocomial. • Aspiration. • Immunosuppression.
Epidemiology • Extremely prevalent.
Microbiology • Community-acquired pathogens: Streptococcus pneumoniae, Mycoplasma pneumoniae, Haemophilus influenzae, Legionella pneumophila. • Hospital-acquired: Gram-negative bacteria, such as Klebsiella, Escherichia coli, and Pseudomonas. • Aspiration: a combination of aerobic and anaerobic bacteria. • Immunosuppression: all previously stated possibilities, including viral, mycobacterial, and Pneumocystis infections. Coexisting infections frequently occur in immunosuppressed individuals.
Pathogenesis Bacterial bypass the lung's defenses and initiate infection within the alveoli.
Presentation: • Productive cough, dyspnea, thoracic discomfort, and pyrexia. Macroscopy • The infected lung parenchyma exhibits a firm texture and a yellowish hue. • Purulent exudate may be expelled from minor air passages. The superficial pleura may exhibit signs of pleuritis. Histopathology The alveolar gaps are occupied by an inflammatory infiltrate abundant in neutrophils. Bacterial colonies are frequently discernible within the exudate. • In instances of aspiration pneumonia, alimentary substances may be found within the lung parenchyma. • Severe instances compounded by abscess formation exhibit loss of lung tissue, replaced by confluent sheets of neutrophils.
Prognosis • Recovery is typically anticipated with suitable antibiotic therapy in an otherwise healthy individual.
Complications encompass respiratory failure, septicaemia, pleural effusion, empyema, and lung abscess. These occurrences are more probable with pathogenic organisms or in people with concurrent cardiac and pulmonary conditions.
Definition: An infection of the lung parenchyma induced by bacterial pathogens.
Classification • Acquired inside the community. • Nosocomial. • Aspiration. • Immunosuppression.
Epidemiology • Extremely prevalent.
Microbiology • Community-acquired pathogens: Streptococcus pneumoniae, Mycoplasma pneumoniae, Haemophilus influenzae, Legionella pneumophila. • Hospital-acquired: Gram-negative bacteria, such as Klebsiella, Escherichia coli, and Pseudomonas. • Aspiration: a combination of aerobic and anaerobic bacteria. • Immunosuppression: all previously stated possibilities, including viral, mycobacterial, and Pneumocystis infections. Coexisting infections frequently occur in immunosuppressed individuals.
Pathogenesis Bacterial bypass the lung's defenses and initiate infection within the alveoli.
Presentation: • Productive cough, dyspnea, thoracic discomfort, and pyrexia. Macroscopy • The infected lung parenchyma exhibits a firm texture and a yellowish hue. • Purulent exudate may be expelled from minor air passages. The superficial pleura may exhibit signs of pleuritis. Histopathology The alveolar gaps are occupied by an inflammatory infiltrate abundant in neutrophils. Bacterial colonies are frequently discernible within the exudate. • In instances of aspiration pneumonia, alimentary substances may be found within the lung parenchyma. • Severe instances compounded by abscess formation exhibit loss of lung tissue, replaced by confluent sheets of neutrophils.
Prognosis • Recovery is typically anticipated with suitable antibiotic therapy in an otherwise healthy individual.
Complications encompass respiratory failure, septicaemia, pleural effusion, empyema, and lung abscess. These occurrences are more probable with pathogenic organisms or in people with concurrent cardiac and pulmonary conditions.
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