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Is Kawasaki Disease the Mystery Illness affecting Children linked to Covid-19

May 17, 2020

New concerns are growing around a mystery illness affecting children that appears to be linked to Covid-19.

Young african boy in bed with fever, having his head sponged.


The way we look at the global pandemic of 2019/2020 continues to evolve, with new questions emerging frequently – this time, it is about Covid-19 causing Kawasaki-like disease in children.

When it first came to global attention, one of the very few ‘reassuring’ aspects of Covid-19 was the fact that hardly any disease was seen in children.

As the weeks progressed, we observed that, while children could be infected, they mostly only seemed to suffer mild disease.

Or; indeed, even if infected; no sign of illness (a state we call asymptomatic).

New Mystery Illness in Children

However, recently, reports from countries such as the UK, USA, and Italy, describe a new mystery illness affecting children with links to Covid-19.

The condition causes a widespread inflammatory reaction in different organs or systems in the affected child.

In medical circles, we refer to this new illness as Paediatric Inflammatory Multisystem Syndrome, PIMS, or Multi-System Inflammatory Disease in Children.

The features of PIMS bear a lot of similarity to another, rarer medical condition known as Kawasaki Disease (KD).

As of the time of publishing this article, the numbers of children affected by this multi-inflammatory illness are relatively few.

However, it has been associated with deaths – one death in the UK and Italy, respectively, as well as three deaths in New York, US. 

Is PIMS the same as Kawasaki Disease- should we be worried

A study from a large paediatric teaching hospital in the Bergamo district in Italy (where the highest rates of infection and death from Covid-19 in the country happened) published recently shows significant similarities to Kawasaki Disease (KD) in children. (5)

The study looked at all children diagnosed with KD, or disease showing features of the disease between Jan 2015 and April 2020.

It showed a 30 times higher occurrence of an inflammatory illness that appears incredibly like Kawasaki between March and April of the year 2020; than seen at the centre for the previous five years.

(This was from 19 children diagnosed with KD over 5 years: versus 10 children seen in 1 month).

Even more, 80% of the children diagnosed with the inflammatory disease in 2020 had positive antibody tests indicating recent infection with SARS-CoV-2, suggesting a link between a Kawasaki-like illness and Covid-19.

We will look at KD and, using reports from affected countries like Italy, compare recent findings of the PIMS to determine if there is a relationship.

Kawasaki Disease – What We Know

It is an acute feverish illness of young children – commonly under 5 years – which causes inflammation in most parts of the body.

The inflammation most commonly affects the heart and its blood vessels.

It leads to a high risk of Coronary Artery Aneurysm (CAA) that could result in death or severe illness.

Compared to other causes of fever in children, it is rare; and to date, we do not know what causes Kawasaki Disease.

KD was first described over 50 years ago (in 1967) by Tomisaku Kawasaki, a Japanese paediatrician. (3)

Scientists wonder whether the cause is viral or bacterial, but no germ is linked to the illness.

The other thinking is that it may be the response of the immune system following a recent infection.

Still, others believe it may be associated with genetics – i.e., inherited since it has been observed more commonly in certain populations (of Japanese and Chinese origin), even after they have left the geographic areas. (3)

However, as it still occurs in other parts of the world, this theory may not fully explain the cause.

Kawasaki Disease is thought to occur more often during the cold winter season than in warm weather and more commonly in boys than girls.

KD presently appears to be the commonest cause of heart problems developing in a child after birth in developed countries (3).

Comparatively, in the Italian study, of the ten children admitted with Kawasaki- like features in the last month, the average age was 7.5 years, with a higher number of boys than girls.

How Common is Kawasaki Disease?

Studies indicate that in the UK, in children under 5 years of age, ~8 in 100,000 get the disease. In the US, the figure for the same group is 25 of every 100,000, while in Japan, it affects 250 children of every 100,000 children. (1,2,3)

In temperate, developing countries such as Nigeria, the disease goes largely without reporting, with 8 cases described over a 5-year period in 2017. (4)

Of the children seen in the Italian report, 19 children were diagnosed with Kawasaki Disease over a 5-year period. (5)

What Does a Child with Kawasaki Disease Look Like?

Generally, a child who has Kawasaki Dx will have a high fever (39-40 deg. C or 102-104F) that starts quite suddenly and fails to improve after 4-5 days.

In addition, they may have:

  1. A noticeable redness of the palms or soles of their feet; swelling affecting the arm or leg joints that may affect walking/movement; flaking or peeling of the skin around the fingers may also happen towards later stages of the illness.
  • A general or widespread skin rash over the body may start 3-5 days after the fever. It might sometimes be itchy and take different forms/shapes – it could look red or pronounced against darker skin.
  • There may be redness of both eyes – that appears like ‘conjunctivitis’, but without pain or discharge from the eyes.
  • Dry, cracked, bleeding lips; soreness or redness within the mouth and a very bright/red tongue.
  • A swollen gland – occasionally, there may be swelling of a lymph gland on one side of the neck/ under the jaw.
  • In children that have a BCG scar (from vaccination against Tuberculosis), reactivation of the scar during the fever could be a symptom of the disease.

Children with Kawasaki in the early stage do tend to appear quite unwell.

  • These same features happen in many other causes of fever in children.
  • In that case, they could (initially) appear as conditions like Measles or bacterial infections like Scarlet fever and Staphylococcal skin infections.
  • Most of the children in the Italian study were admitted after 4-6 days of fever.
  • They also had other features that were like the forms of Kawasaki Disease we presently know.
  • In the early/acute stage (7-14 days from when the fever started) of Kawasaki Disease, they may also develop other serious conditions in addition to heart complications:

Meningitis, Ear infection, Pneumonia, Liver/ Kidney or Bowel problems, infection of the urine tract and testes and other skin irritation.

Involvement of the heart can occur within the acute stage of the disease, too.

Its features include inflammation of the heart muscle as well as the coronary artery aneurysm, which can lead to the development of blood clots.

An aneurysm happens when the wall of a blood vessel gets bigger or swells because of the weakness of the wall.

This could make the blood vessel burst with a considerable amount of


Aneurysms can happen all over the body for different reasons, but the blood vessels of the heart (coronary vessels) happen to be the largest target in Kawasaki.

The disease of the heart can continue even after the fever has stopped.

Generally, we think that the period just after the acute stage, i.e. after 2 weeks of onset, is when the child may be at the highest risk of sudden death. (1)

Children with Kawasaki Disease may, therefore, have an extremely fast heartbeat and show other signs of heart disease when examined. 

Heart disease is the main cause of death in the disease, as well as severe shock that may develop alongside the illness.

How Kawasaki Disease is Diagnosed

The diagnosis and treatment of KD usually happen in the hospital.

There are no specific tests that show Kawasaki Disease.

However, a range of abnormal test results with the child’s examination can all indicate KD being the likely cause of the illness.

 Some examples of the tests are:

  • Blood tests for inflammatory markers, white cells, liver, and kidney disease.
  • Chest X-ray for Pneumonia.
  • Urine tests for urine infections, Lumbar Puncture to check for Meningitis
  • ECG looking for abnormal heart rhythms.
  • Scans such as ECHO (echocardiogram) for the heart

Children from the Italian study had abnormal examinations and several tests which showed high inflammatory markers, abnormal heart enzymes, abnormal ECHO with signs of inflammation or other damage in the heart, and pneumonia on chest X-ray.

For most of them, there were no signs of acute infection with the SARS virus, despite a positive antibody test which makes doctors think that developing the disease could be a late complication of Covid-19.

How is Kawasaki Disease Treated

The condition does not respond to antibiotics or other anti-infective treatments.

The key aim in the treatment of KD is to reduce the risk of inflammation happening in the coronary arteries leading to severe bleeding, blood clots or damage to the blood vessels from aneurysms and other heart complications.

We achieve this mainly with the use of medicines known as immunoglobulins, blood thinners like Aspirin, and in some cases, steroids.

They may also require supportive treatments such as intravenous fluids and medicines to relieve fever or pain.

Treatment also aims at other conditions that may happen to co-exist with KD, such as pneumonia or ear infections.

The recovery period can take up to 12 weeks (3 months), and at this point, in most kids, the clinical symptoms would have completely settled.

However, even at this stage, there are still risks of heart problems which is why monitoring the heart activity using a scan of the heart (ECHO) will be required following recovery.

In a small percentage of chronic cases, the children will have heart problems that continue all their lives.

This is because they may have developed aneurysms that will continue into adulthood and could burst at that time.

They may also form blood clots which could cause injury/damage to tissues and death.

All the children in the Italian study responded very well to treatments with a combination of Immunoglobulins, Aspirin, and steroids – with no fatality recorded.

Summarising (for now)

What should parents think about Kawasaki Disease, PIMS and Covid-19?

While more studies are going on in different parts of the world, many doctors are calling for calm (6).

Reports suggest some features in PIMS do not occur in Kawasaki Disease.

Some doctors argue that PIMS is not Kawasaki Disease, as this is quite rare (recall 19 children in 5 years vs 10 children in 1 month in Bergamo?) and unlikely to have occurred so frequently in one month.

They also argue that the features of PIMS may be from a different (bacterial) infection causing shock; or else some other unknown illness process.

While addressing these questions goes on, parents should be watchful for illnesses with remarkably high fever in children (regardless of age) and do the following:

  • Request advice from your health provider promptly about ill health in your child – especially for a very high temperature (fever) that is not getting better after 2 days.
    • Watch out for red eyes, skin rash, cracked or bleeding lips, or a child appearing much more ill than their obvious symptoms suggest.
  • This should facilitate early referral to a tertiary centre for the necessary tests, prompt diagnosis and treatment.
  • Remember that the majority of cases of Kawasaki Disease are curable and have a low fatality with prompt treatment and monitoring. The mystery illness appears similar in this respect.

More Reading:

Learn More Health Info on Child Health:


1.  Kawasaki Disease –

2.  Kawasaki Disease Clinical Presentation – Medscape

3. Management of Kawasaki Disease – Arch.Dis.Childhood

4. The diagnosis of Kawasaki disease among Nigerian children: a nightmare for the caregivers and the doctors – Journal of Public Health and Emergency.

5. An outbreak of severe Kawasaki-like disease at the Italian epicentre of the SARS-CoV-2 epidemic: an observational cohort study – Lancet.

6.  ‘No need to generate undue alarm’: Doctors call for calm amid media hype over Covid-19-linked inflammatory syndrome in children’ –

Editing by AskAwayHealth Team


All AskAwayHealth articles are written by practising Medical Practitioners on a wide range of healthcare conditions to provide evidence-based guidance and to help promote quality healthcare. 

The advice in our material is not meant to replace the management of your specific condition by a qualified healthcare practitioner.
To discuss your condition, please contact a health practitioner or reach us directly

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