A cluster of positive coronavirus cases in parts of Newport has led to a multi-agency effort to test students.
Some cases have been identified as the Delta (Indian) strain - a variant of concern - and some of them are known to be linked.
The positives cases have been identified in Maindee and Somerton, which involves a number of households.
Newport City Council, Public Health Wales (PHW), and the Aneurin Bevan University Health have asked residents who live near to the affected households to take precautionary tests.
Parents of students at St Julian’s High School reported on Saturday that people were turning up to their homes to test their children, after reported positive cases among Year 8 pupils at the school.
Some residents said it had taken them by surprise and would have liked more notice, but most said testing was "professionally and efficiently done".
Last week an extra 39 cases of the Indian variant of coronavirus identified in Wales meant there was at least close to 100 cases in the country.
Newport City Council has confirmed staff from the health board have carried out a “large number of tests over the weekend” adding they were "grateful to residents, parents and pupils who have co-operated to help prevent the onward spread of infection".
Two year groups at Maindee Primary School are also being tested as a precaution.
The school groups were already self-isolating and they have been asked to extend that period from 10 to 14 days as an extra safety measure.
A mobile testing unit has been set up in the council-owned Maindee car park in Chepstow Road and this will remain there until at least Friday. It is open from 9am to 5pm.
A statement from the council alongside PHW and the health board reads: “We cannot stress too highly how important it is that people cooperate with the TTP (test, trace, protect) service by giving details of their contacts and self-isolate when told – this is a legal requirement and helps protect loved ones and other people, particularly vulnerable residents.
“Members of the public must do everything they can to prevent transmission of coronavirus by sticking to social distancing guidelines – staying two metres away from others, washing hands regularly, working from home if they can, and wearing a face covering where required.
“If you or a member of your household develop a cough, fever or change in sense of taste or smell, you must self-isolate immediately and book a free Coronavirus test, either by calling 119 or by visiting www.gov.wales/getting-tested-coronavirus-covid-19 .
“Vaccinations are an important part of the fight against Covid-19 which can have a devastating impact on people’s health and lives. If you are over-18 and have yet to receive a vaccine, get in touch with the Aneurin Bevan University Health Board https://abuhb.nhs.wales/coronavirus/covid-19-vaccine/not-vaccinated-yet/ ."
