Cases of hepatitis in children are being investigated as more cases have been found in the UK, Europe and USA.
According to health officials, it is likely a virus which causes flu symptoms, known as adenovirus, could be the cause.
They are now looking into over 100 cases in the UK with 14 being in Scotland.
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Children aged 10 and under are experiencing sudden onset hepatitis (liver inflammation) but the usual viruses that cause infectious hepatitis (hepatitis A to E) have not been detected.
The active investigation by UK Health Security Agency have found a further 34 cases, bringing the total to 108 in the UK.
There are 79 cases recorded in in England, 14 are in Scotland and the remainder are in Wales and Northern Ireland.
Of these cases, eight children have received a liver transplant.
The UKHSA have said there is no link to the coronavirus vaccine. None of the currently confirmed cases in the UK is known to have been vaccinated.
However 77 per cent of cases tested were positive for adenovirus, a group common viruses which can trigger the common cold, vomiting and diarrhoea.
The UKHSA adds: "However, as it is not usual to see this pattern of disease from adenovirus, we are actively investigating other possible contributing factors, such as another infection (including Covid-19) or an environmental cause."
Dr Meera Chand, Director of Clinical and Emerging Infections at UKHSA, said: "We are working with the NHS and public health colleagues in Scotland, Wales and Northern Ireland to swiftly investigate a wide range of possible factors which may be causing children to be admitted to hospital with liver inflammation known as hepatitis.
"Information gathered through our investigations increasingly suggests that this is linked to adenovirus infection. However, we are thoroughly investigating other potential causes.
"Normal hygiene measures such as thorough hand washing (including supervising children) and good thorough respiratory hygiene, help to reduce the spread of many common infections, including adenovirus.
"We are also calling on parents and guardians, to be alert to the signs of hepatitis (including jaundice) and to contact a healthcare professional if they are concerned."
