Speaking at the ministry's media conference on Friday, Deyalsingh said the message is one of concern, but the current protocols in place had caught the case present in a repatriated national.
The new strain, which was first discovered in Kent, is already more easily transmitted than the older one, too - meaning it is infecting more Brits.
The B117 variant first emerged in London and southeastern England late past year and has since been detected in dozens of countries.
It's being blamed for the huge increases in cases in the United Kingdom in the last month.
The fast-spreading "U.K. variant" of the coronavirus might also be more deadly, Prime Minister Boris Johnson said Friday, an alarming development that will burden the British health system and reverberate around the world.
"There is evidence that there is an increased risk for people who have the new variant, compared to the old variant", said Sir Patrick Vallance, the government's Chief Scientific Adviser who joined Johnson at the briefing.
"I think it's really good that science and policy are on the same page in being transparent, sharing data early, and making people aware of the situation", he said. It is a pitched battle that scientists say evokes hope as well as anxiety.
Outside experts said that the early claims of higher mortality were far from resolved. The total number of coronavirus-related deaths in Britain rose by 1,401 in one day to 95,981. But this depends on a relatively small amount of data.
However, when looking at the data for people who have tested positive, there is an indication that the rate for the new variant is higher.
"We are more concerned that they have certain features that they might be less susceptible to vaccines", he said.
'The first gives the great majority, as far as we can see, of the initial protection, but the second vaccine increases that, and probably makes it longer lasting as well. And whatever the fatality rate, scientists said the best answer to the new variant had not changed: lockdowns, face coverings and vaccines.
Yet as Britain's top health authorities have warned about grim weeks ahead, the latest vaccination figures have offered a glimmer of hope: almost 5.5 million people had received a first vaccine dose in Britain as of Friday, according to government data.
The World Health Organisation has recommended that the gap should be a maximum of 6 weeks - but the UK's Medicines and Healthcare Products Regulatory Agency (MHRA) has opted to delay a second Pfizer dose for up to 12 weeks, to ensure more people get the first jab sooner.
Vallance said there was no evidence that the vaccines being deployed were not effective against the variant first identified in Britain.