Your child has had a fever for over a week. You've been to the doctor multiple times, done blood tests and scans, but nothing explains it. Antibiotics aren't helping. This frustrating situation—called a "fever of unknown origin" (FUO)—happens more often than many parents realise in Singapore and Asian hospitals.
The challenge is that traditional ways of finding infections, like growing bacteria in a lab or examining samples under a microscope, take days or weeks and don't always catch the culprit. A new genetic test called metagenomic next-generation sequencing (mNGS) scans for pathogens in a completely different way: it reads the genetic material in a sample to identify bacteria, viruses, fungi, and other microbes. A recent study from China tested whether this technology could help solve these medical mysteries in children.
New test finds infections standard tests miss
Doctors used mNGS on 41 hospitalised children with unexplained fevers alongside traditional testing. The new genetic test identified infections in roughly half the cases—uncovering bacteria, viruses, and fungi that standard methods had missed. When mNGS did find something, it changed how doctors treated the child: some received antivirals they hadn't been given before, others switched to different antibiotics, and some stopped unnecessary medications.
But mNGS isn't more accurate overall—it's a second opinion
Here's the important caveat: when researchers compared both methods head-to-head, mNGS and traditional testing found infections at similar overall rates. Neither method proved significantly better than the other. The real value of mNGS emerges specifically when your child is clearly unwell, but standard tests keep coming back negative. In those frustrating situations, the genetic test can detect pathogens that traditional methods overlooked, giving doctors a clearer path forward and saving your child from weeks of guessing and unnecessary treatment.
Why this matters for Singapore and regional families
In Singapore hospitals, traditional testing will remain the first step—it's reliable, established, and usually sufficient. But if your child's fever persists despite treatment, or if initial tests suggest infection but confirm nothing, mNGS may be offered as an additional tool.
For Asian families, this technology has particular relevance. If your child has recently travelled to see relatives elsewhere in the region, they may have picked up an uncommon infection that Singapore's standard lab tests aren't designed to catch immediately. mNGS can scan for a much broader spectrum of microbes, making it especially useful in these cases. The technology also means fewer days of trial-and-error antibiotics—doctors can make targeted decisions faster, potentially reducing side effects and hospital stays.
What this means for your child's care
- Expect traditional blood tests and cultures first; they remain the standard starting point for fever workups.
- If fever persists and standard tests are negative, ask your doctor whether mNGS could help identify the cause.
- mNGS is most valuable for children with recent travel to other parts of Asia or unexplained fevers lasting more than one week despite treatment.