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Biology of parainfluenza viruses
1Department of Virology, University of Turku, Finland.
Insights
Human parainfluenza viruses (PIVs) cause respiratory infections in children. Diagnosis involves detecting the virus or antibodies, with PCR and immunoassays being key methods for identification.
Area of Science:
- Virology
- Immunology
- Infectious Diseases
Background:
- Human parainfluenza viruses (PIVs) are significant respiratory pathogens, particularly in infants and children.
- PIV1, PIV2, and PIV3 are leading causes of croup, second only to respiratory syncytial virus.
- Accurate diagnosis of PIV infections relies on detecting the virus, its components, or host immune responses.
Purpose of the Study:
- To review current diagnostic methods for PIV infections.
- To discuss the role of animal models in PIV research.
- To highlight advancements in PIV vaccine development.
Main Methods:
- Detection of viral antigens in clinical specimens using immunoassays.
- Polymerase Chain Reaction (PCR) for sensitive PIV detection.
- Serological diagnosis through immunoglobulin G (IgG) or immunoglobulin M (IgM) antibody detection.
Main Results:
- Immunoassays and PCR are currently the most common methods for PIV diagnosis.
- Animal models are crucial for studying PIV pathogenesis and vaccine efficacy.
- Various vaccine strategies, including live attenuated, inactivated, recombinant, and subunit vaccines, are under investigation.
Conclusions:
- Effective diagnosis of PIVs requires specific detection methods.
- Research into PIV molecular structure and replication is advancing prevention and treatment.
- Future development of PIV vaccines holds promise for controlling these infections.
Abstract:
Parainfluenza virus types 1 to 4 (PIV1 to PIV4) are important human pathogens that cause upper and lower respiratory tract infections, especially in infants and children. PIV1, PIV2, and PIV3 are second only to respiratory syncytial virus as a cause of croup in young children. Although some clinical symptoms are typical of PIVs, etiologic diagnosis always requires detection of infectious virus, viral components, or an antibody response. PIVs are typical paramyxoviruses, causing a syncytial cytopathic effect in cell cultures; virus growth can be confirmed either by hemadsorption or by using immunological reagents. Currently, PIV is most often diagnosed by demonstrating viral antigens in clinical specimens by rapid and highly sensitive immunoassays. More recently, PCR has been used for the detection of PIVs. Serological diagnosis is made by detecting a rising titer of immunoglobulin G or by demonstrating immunoglobulin M antibodies. PIVs infect species other than humans, and animal models are used to study the pathogenesis of PIV infections and to test candidate vaccines. Accumulating knowledge on the molecular structure and mechanisms of replication of PIVs has accelerated research on prevention and treatment. Several strategies for vaccine development, such as the use of live attenuated, inactivated, recombinant, and subunit vaccines, have been investigated, and it may become possible to prevent PIV infections in the near future.