UK Border Force officials detained five unaccompanied youngsters at Portsmouth International Port on Wednesday morning after they were caught trying to sneak into the UK.
The asylum seekers, who Home Office officials said had fled from Sudan, have since been taken into the care of Portsmouth City Council.
But health fears have been raised by a social care whistleblower at the authority over how the children were dealt with amid the on-going coronavirus pandemic.
The source claimed the youngsters had travelled through Italy, which has the worst outbreak of the disease outside China, with more than 800 deaths and almost 12,500 people infected with Covid-19.
However, no quarantine procedures were put in place when dealing with the refugees, with the insider warning: ‘Lives are being put at risk unnecessarily.
‘They came through Italy and France and arrived in Portsmouth in the back of lorries. But none of them were quarantined.
‘They were given temperature checks and then sent to foster families in Portsmouth.
‘We have to be sensible, this is not sensible…to do absolutely nothing is just dangerous.’
Symptoms of the virus can take between two and 14 days to appear after infection.
Sarah Daly, deputy director for children and families at the council, said: ‘We took in five vulnerable and traumatised unaccompanied children on Wednesday who had been passed into our care after a health assessment by colleagues from the government's border force and allowed into the UK. There was no evidence to support quarantine or self-isolation.
‘We take the safety and wellbeing of our staff extremely seriously. We're working closely with Public Health England and following all official guidance.’
But the council insider demanded more action was taken to protect staff.
‘We all feel like we’re being pushed into a situation that’s really unfair,’ they said.
‘Portsmouth City Council has a duty of care to its employees. But we’re not even being given basic things like hand gel.’
Ms Daly said staff were ‘aware’ of national guidance on washing hands and following good hygiene practices.
She added: ‘National guidance does not recommend using items like masks unless a member of staff is a health and care worker in a clinical setting.’
Portsmouth has 100 unaccompanied children in its care, taking on 12 since the start of the year.
The Home Office insisted migrants were ‘medically assessed’ and that any individuals showing Covid-19 symptoms would be given the ‘appropriate health advice and treatment’.
A spokeswoman added: ‘The group presented themselves as Sudanese nationals and were all claimed minors. They have been passed into the care of social services and their cases will be dealt with according to the immigration rules.’
On Friday Boris Johnson described the pandemic as the ‘worst public health crisis in a generation’.
It has since prompted the cancellation of all Premier League and British football league matches until April.