Related Experiment Video
Updated: Jun 12, 2026

09:27
A Rapid Strategy for the Isolation of New Faustoviruses from Environmental Samples Using Vermamoeba vermiformis
Published on: June 4, 2016
Advances in Mimivirus pathogenicity.
Agnès Vincent1, Bernard La Scola, Laurent Papazian
1Département d'Anesthésie-Réanimation, Hôpital de la Conception, Assistance Publique-Hôpitaux de Marseille, Université de la Méditerranée, Marseille, France.
Intervirology
|June 17, 2010
Summary
Mimivirus, the largest known virus, may cause hospital-acquired pneumonia in intensive care unit (ICU) patients. Serological evidence suggests Mimivirus infection is linked to longer mechanical ventilation and ICU stays.
Area of Science:
- Microbiology
- Infectious Diseases
- Virology
Background:
- Viral infections are a significant concern in clinical settings, particularly for intensive care unit (ICU) patients.
- Giant viruses, such as Mimivirus, are increasingly recognized as potential causes of both community-acquired and hospital-acquired pneumonia.
- Previous studies relied on serological diagnostics, indicating higher Mimivirus antibody levels in pneumonia patients compared to healthy individuals.
Purpose of the Study:
- To investigate the potential role of Mimivirus in nosocomial pneumonia.
- To assess the clinical impact of Mimivirus infection in ICU patients.
Main Methods:
- Serological diagnosis was employed to detect antibodies against Mimivirus.
- A matched-cohort study compared ICU patients with and without serological evidence of Mimivirus pneumonia.
- Clinical outcomes, including duration of mechanical ventilation and ICU stay, were analyzed.
Main Results:
- Serological evidence of Mimivirus pneumonia was identified in mechanically ventilated ICU patients.
- Patients with serological evidence of Mimivirus pneumonia experienced longer durations of mechanical ventilation and ICU stay compared to seronegative controls.
- PCR identification of Mimivirus proved challenging due to high nucleotide sequence polymorphism.
Conclusions:
- Mimivirus is a potential causative agent of nosocomial pneumonia in ICU patients.
- Serological evidence of Mimivirus infection is associated with increased morbidity in ICU settings.
- Further research is required to confirm the clinical significance of Mimivirus in human infections and improve diagnostic techniques.
Related Concept Videos
Inhibitors of Virion Maturation and Assembly
As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...
Viral Mutations
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...

