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Causes of pneumonia presenting to a district general hospital
Abstract:
The incidence of bacterial, viral, mycoplasma, and rickettsial infections has been assessed prospectively in 210 adult patients with pneumonia who presented to a district hospital over a six-year period. One hundred and thirteen infective agents were detected in 103 patients. The agent most frequently detected was Mycoplasma pneumoniae which accounted for 30 infections. A bacterial pathogen was found in 43 patients. Streptococcus pneumoniae was the most common of these (24 patients); Staphylococcus aureus (eight), Haemophilus influenzae (four), Klebsiella spp (three), and Legionella pneumophila (three) were all less common. Chlamydial or rickettsial infections (Psittacosis or Q fever) were detected in nine patients. Viral infections were found in 31 patients (22 influenza A, four influenza B, two parainfluenza, and three respiratory syncytial virus). There were 10 patients in whom more than one pathogen was identified. In 107 patients no pathogens could be identified. Seventy-five per cent of these patients had either received antibiotics before entering hospital, or were unable to produce any sputum for culture. The incidence of bacterial pneumonia has probably therefore been underestimated. Nevertheless this survey does emphasise the importance of M pneumoniae as a pathogen in patients with pneumonia presenting to hospital.
Insights
Mycoplasma pneumoniae was the most common cause of pneumonia in a district hospital study. Bacterial pneumonia incidence may be underestimated due to prior antibiotic use or lack of sputum samples.
Area of Science:
- Infectious Diseases
- Pulmonary Medicine
- Microbiology
Background:
- Pneumonia remains a significant cause of morbidity and mortality in adults.
- Identifying the causative agent of pneumonia is crucial for effective treatment.
- Previous studies have varied in their findings regarding the prevalence of different pneumonia pathogens.
Purpose of the Study:
- To prospectively assess the incidence of bacterial, viral, mycoplasma, and rickettsial infections in adult pneumonia patients.
- To determine the most frequent causative agents of pneumonia presenting to a district hospital.
- To evaluate factors influencing pathogen detection rates.
Main Methods:
- Prospective study over six years involving 210 adult pneumonia patients.
- Identification of infective agents including bacteria, viruses, Mycoplasma pneumoniae, and rickettsial pathogens.
- Analysis of pathogen detection rates and factors affecting identification, such as prior antibiotic use and sputum culture availability.
Main Results:
- 113 infective agents were detected in 103 patients.
- Mycoplasma pneumoniae was the most frequent pathogen (30 infections).
- Bacterial pathogens were identified in 43 patients, with Streptococcus pneumoniae being most common (24). Viral infections occurred in 31 patients. Chlamydial/rickettsial infections in nine. Over half of patients (107) had no pathogen identified, often due to prior antibiotics or inadequate sputum.
Conclusions:
- Mycoplasma pneumoniae is a significant pathogen in adult hospital-presenting pneumonia.
- The incidence of bacterial pneumonia is likely underestimated.
- Improved diagnostic strategies are needed, especially for patients with pre-hospital antibiotic treatment or poor sputum quality.