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Atypical respiratory pathogens
1National Public Health Institute, Department in Oulu, Oulu, Finland.
Abstract:
The main atypical pathogens in respiratory tract infections are classified on the basis of their ability to cause atypical pneumonia. This is not a well-defined clinical entity, and it is evident that atypical pathogens can sometimes cause 'typical' pneumonias and vice versa. This emphasizes the need for microbiological diagnosis, since it affects the selection of proper treatment, in which beta-lactam antibiotics and aminoglycosides are not effective. Moreover, mixed infections caused by atypical and typical pathogens together are common. At this moment rapid and sensitive diagnostic methods are lacking. Besides numerous viruses, the main bacterial pathogens causing atypical pneumonias are Mycoplasma pneumoniae, two chlamydial species, Chlamydia pneumoniae and C. psittaci, one rickettsia, Coxiella burnetti, and several Legionella species. The majority of these pathogens cause upper respiratory tract infections more often than overt pneumonias. An atypical agent, Chlamydia pneumoniae, has also been associated with chronic inflammatory conditions in the cardiovascular system. The most recently discovered pathogen in atypical pneumonias is a hantavirus causing hantavirus pulmonary syndrome.
Insights
Atypical pathogens cause respiratory infections, including pneumonia, necessitating accurate diagnosis for effective treatment. Current diagnostic methods are insufficient for these common mixed infections.
Area of Science:
- Microbiology
- Infectious Diseases
- Pulmonology
Background:
- Atypical pathogens are significant causes of respiratory tract infections, including pneumonia.
- The clinical presentation of atypical pneumonia is not well-defined, and pathogens can cause typical pneumonia.
- Mixed infections involving both typical and atypical pathogens are common.
Purpose of the Study:
- To highlight the importance of microbiological diagnosis in respiratory tract infections.
- To underscore the limitations of current diagnostic methods for atypical pathogens.
- To discuss the range of pathogens responsible for atypical pneumonias.
Main Methods:
- Classification of atypical pathogens based on their association with atypical pneumonia.
- Review of common bacterial and viral agents causing atypical pneumonias.
- Discussion of diagnostic challenges and treatment implications.
Main Results:
- Atypical pathogens include Mycoplasma pneumoniae, Chlamydia pneumoniae, Chlamydia psittaci, Coxiella burnetti, Legionella species, and hantavirus.
- These pathogens frequently cause upper respiratory tract infections and are implicated in cardiovascular conditions.
- Beta-lactam antibiotics and aminoglycosides are ineffective against these atypical agents.
Conclusions:
- Accurate microbiological diagnosis is crucial for selecting appropriate treatments for respiratory infections.
- There is a need for the development of rapid and sensitive diagnostic methods for atypical pathogens.
- Understanding the spectrum of atypical pathogens is essential for managing respiratory diseases.