health microbiology

1. Journal Reading
Supervisor:
dr. A. R. Sultan, DMM., M.Sc., Ph.D., Sp.M.K.
CLINICAL MICROBIOLOGIST IN TRAINING FACULTY OF MEDICINE
HASANUDDIN UNIVERSITY MAKASSAR
2023
Lalu Yan Hidayat
C195222004
Future Biomarkers for Infection and Inflammation in Febrile Children
Judith Zandstra, Ilse Jongerius and Taco W. Kuijpers

2. Introduction
Febris
Children
Adult
Inflammation,
response
bacterial,virus,
parasite, non
infectious
Same with
children and
malignancy

3. Cont..
In this journal, we will discuss how to differentiate the causes of fever by
looking at the results of biomarker results. Where biomarker examination
can be used in the future to differentiate the causes of fever in children.
Beyond the distinction between bacterial versus viral disease, fever can be
part of the early presentation of many autoinflammatory or autoimmune
diseases.
These are rare, more difficult to diagnose and is often mistaken for an
infectious disorder

4. Simplified Scheme Of the Induction Of Fever and Release Acute Phase Response Protein
In this picture can show how
the initial reaction of the
body's defense in the infection
reaction process to release
biomarkers

5. Potential New Biomarkers for Infection
Soluble CD14 (presepsin)
https://www.sciencedirect.com/science/article/abs/pii/S1359610119300760
• Receptor on monocytes and macrophages
that recognizes different surface structures
on Gram-positive and Gram-negative
bacteria, including lipoteichoic acid and
proteoglycans or lipopolysaccharides.
• In adults PCT and presepsin have similar
diagnostic accuracy.Presepsin has a higher
sensitivity but a lower specificity than PCT or
CRP in diagnosing sepsis in children
• Presepsin alone had a high sensitivity and
specificity to diagnose neonatal sepsis

6. • Interferon induced MX1 and MX2 (biomarker virus) (Sensitivty but lower)
High-molecular weight GTPases MX1 and MX2 play a significant role in the interferon-induced
inhibition of viral replication. Human MX1 is a restriction factor of broad antiviral activity, able
to inhibit a great diversity of RNA and DNA viruses at different stages of their life cycles.
https://www.irim.cnrs.fr/index.php/en/researchh/teams/interferon-and-antiviral-restriction

7. • TNF-related apoptosis-inducing ligand (TRAIL), TNF-related apoptosis-inducing ligand (TRAIL) is a member of
TNF superfamily, which can favorably induce apoptosis in a variety of primary tumor cells
• IFN-g-induced protein-10 (IP-10, CXCL10), IFN-gamma-inducible protein 10 (IP-10, CXCL10), a chemokine
secreted from cells stimulated with type I and II IFNs and LPS, is a chemoattractant for activated T cells.
Expression of IP-10 is seen in many Th1-type inflammatory diseases, where it is thought to play an important
role in recruiting activated T cells into sites of tissue inflammation.
Further studies are being conducted to combine plasma biomarkers to discriminate between bacterial from
viral infection, of which a selection of promising studies

8. Examination Combination Biomarker
1. Soluble TNF-related apoptosis-inducing ligand (TRAIL), IFN-g-induced protein-10 (IP-10, CXCL10) and CRP
were used in combination to distinguish between bacterial and viral infection in children and adults.
2. In contrast to CRP, the biomarkers TRAIL and IP-10 showed increased protein levels in viral infections.
Known as the ImmunoXpert test, the assay has the potential to be developed into a ready-to-use assay to
prevent inappropriate antibiotic use in patients with infections.
3. An accurate diagnosis of bacterial or viral infection within 1 hour using flow cytometry was possible using a
set of surface proteins on neutrophils and monocytes, including Fcg receptor I (FcgRI/ CD64), FcgRII/CD32,
complement receptor 1 (CR1/CD35), HLA-class-I, and the receptor for complement-derived anaphylatoxin
C5a (C5aR/CD88) (67). CD32, CD35 and CD88 all have a higher expression on both neutrophils and
monocytes in bacterial infections compared to viral infections, whereas HLA-class-I and CD169 on
monocytes were increased in viral infections rather than bacterial infections

9. Characteristic combined diagnostic markers

10. Biomarkers in Inflammatory Diseases
• IL-18 and IL-1 are involved in classic autoinflammatory diseases including Familial Mediterranean Fever,
cryopyrinopathies, and hyperimmunoglobulin D Syndrome , in which the enzyme protein complex known as
the inflammasome that processes the pro-forms of IL-18 and IL-1 is dysregulated by genetic mutation
Activated after proteolysis and has a variety of cell-
specific roles that maintain homeostasis. (A) Pro-IL-
1α/β is activated after cleavage by a diverse range of
proteases. Active IL-1 binds to its signalling receptor IL-
1R1 and elicits downstream signalling. IL-1 signalling is
inhibited by binding to soluble or cell surface decoy
receptor IL-1R2, or by competition from the IL-1
receptor antagonist (IL-1RA) for IL-1R1. (B–E) The
production and response to IL-1 by specific cell types is
important for the maintenance of cell function and
homeostasis. (F, G) Dysregulation of IL-1 signalling can
exacerbate or drive development of disease.
https://www.frontiersin.org/articles/10.3389/fimmu.2020.613170/full

11. IL 18 belongs to the IL-1 family of
cytokines, which is a group comprising
11 member cytokines that promote
the activity of the innate immune
system. IL-18 stimulates both the
innate immune and acquired immune
responses
https://www.frontiersin.org/articles/10.3389/fimmu.2020.613170/full

12. • S100A8/A9 and S100A12 Biomarker
Numerous other biomarkers are studied
for diagnosis and monitoring of
autoinflammatory diseases . S100A8/A9
and S100A12 are good biomarkers for
diagnostic purposes, monitoring disease
activity, predicting treatment response,
or risk for relapse in such non-infectious
febrile diseases , including soJIA, adult
Still’s disease and the above mentioned
classic fever syndromes
https://www.mdpi.com/2073-4409/11/15/2274

13. Transcriptomics
• Recent studies show that highly sensitive and specific biomarkers can be found using RNA transcript analysis
• RNA transcriptional activity changes during the course of disease leading to different transcript levels, new
transcripts or splice variants when compared to the healthy state or among different diseases.
• This has led to a 2-transcript host RNA signature of combining FAM89A and IFI44L to discriminate between
bacterial or viral infection in children
• Using these RNA signatures it was shown that while >90% of patients present in the group of unknown
infections received antibiotic, only 46% of this group had a bacterial infection
• RT-qPCR was developed which efficiently distinguished between bacterial and viral infections, as well as a
point-of-care test with the improved transcript signature, showing potential for rapid testing in the near
future. In adults though, distinguishing bacterial disease and sepsis from viral disease or inflammation using
transcriptomics was shown to be challenging if not ineffective, showing the limitations

14. Biomarkers via Mass Spectrometry or Multiplexed Protein Microarrays
(A) Multiplex bacterial and viral infection
biomarker detection is generally based on
immunoassay (protein-based biomarkers)
and hybridization (genetic-based
biomarkers) techniques. (B) Several point-of-
care methods such as lateral flow assays,
microfluidic devices, and microarrays have
been developed. (C) These methods have
been expanded to multiplex assays based on
the several innovations. (C1) Capture
antibody conjugated with different
reporters. (C2) Double test line or double
flow path. (C3) Vertical flow design divides
the sample into multiple wells. (C4)
Isothermal nucleic acid amplification with
multiple primers. (C5) Multiple immobilized
probes
Scheme of Recent Multiplex Point-of-Care Testing for Infection Diseases.

15. Characteristics transcriptomic biomarkers.

16. (A) Viral infection induces interferon
stimulated gene (ISG) stimulation. Antiviral
proteins (MX1, OAS1) will inhibit viral
replication in the cell. Secretion of Type I IFN
by the infected cell will lead to paracrine
signaling to the neighboring cell via JAK/STAT
signaling, thereby stimulating ISG in non-
infecting cells, leading to an antiviral state,
preventing further viral infection. The anti-
viral immune response is induced by
activating various immune cells, especially
CD8+ T cell survival and natural killer (NK) cell
activation. (B) In autoimmune disease, such as
Systemic Lupus Erythematosus (SLE), a variety
of environmental factors can trigger the
disease in genetically predisposed individuals.
Schematic view of the different steps of interferon signaling
involved in viral infection and autoimmune disease

17. CONCLUSION
• PCT is specifically used to differentiate between bacterial and viral infections in neonatal sepsis
• IL-18 is a good biomarker for various auto-inflammatory diseases
• A rapid increase in the development of combination tests is observed.
• 2- transcript host RNA signature of combining EMR1-ADGR and IFI44L could discriminate between bacterial
or viral infection in children
• transcriptome analysis is able to distinguish between bacterial subgroups (i.e. Gram-positive and Gram-
negative, atypical, or mycobacterial infections)