Related Experiment Video
Updated: Sep 22, 2025
06:08
Author Spotlight: A Pseudotype Virus System for Assessing Omicron Subvariants and Neutralizing Antibodies in SARS-CoV-2 Research
Published on: September 8, 2023
1.4K
Type-H, and Type-L COVID-19: are they different subtypes or the same?
1Department of Anesthesiology and Reanimation, Infectious Diseases Department, Kecioren Training and Research Hospital, Ankara, Turkey. dr.necladereli@gmail.com.
Summary
This study explored two types of COVID-19 pneumonia (L-type and H-type) but found no significant differences in treatment outcomes or mortality rates between them. Further research is needed to understand if these types represent distinct disease forms or stages.
Area of Science:
- Pulmonology
- Infectious Diseases
- Radiology
Background:
- COVID-19, caused by SARS-CoV-2, primarily affects the respiratory system, leading to severe pneumonia and acute respiratory distress syndrome (ARDS).
- Clinical and radiological heterogeneity in COVID-19 pneumonia necessitates further investigation into potential classifications.
Purpose of the Study:
- To investigate whether COVID-19 pneumonia cases can be categorized into distinct clinical and radiological types.
- To compare the clinical characteristics, inflammatory markers, and imaging findings of different COVID-19 pneumonia subtypes.
Main Methods:
- Retrospective analysis of 29 COVID-19 associated ARDS patients diagnosed with severe pneumonia.
- Classification into L-type and H-type based on clinical (PEEP, lung compliance) and CT findings (ground-glass opacity severity).
- Comparison of inflammatory markers (CRP, ferritin, D-dimer, PCT, WBC, lymphocytes) and arterial blood gas analysis between groups.
Main Results:
- Prone positioning improved oxygenation in both L-type and H-type patients.
- No statistically significant differences were observed in intubation times, hospital stays, cytokine levels, response to prone positioning, or mortality rates between the two groups.
- 7 of 22 L-type patients required intubation, with 5 fatalities.
Conclusions:
- The study questions whether L-type and H-type represent distinct forms of COVID-19 pneumonia or intertwined stages of the disease.
- Current findings suggest that subtyping COVID-19 pneumonia may not significantly alter treatment strategies.
Related Concept Videos
01:05Single Nucleotide Polymorphisms-SNPs
16.1K
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
16.1K
00:36Viral Mutations
33.5K
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...
33.5K
01:29Viruses with RNA Genomes
169
RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
169