Education unions are warning of chaos in schools as Boris Johnson presses ahead with plans to axe Covid rules in England.
Unison, Unite and the GMB, which represent school support staff, are urging the Prime Minister to keep in place free testing and the requirement to self-isolate.
The three unions warned that the failure to provide clear detailed guidance risks a "super spreader free-for-all" in schools and other workplaces.
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If remaining safety rules are axed, schools will be left in an "impossible situation", the unions added.
Parents will be unsure about whether to send their children into school, transmission rates could soar and new, more potent variants could emerge, they said.
Calls are also being made for the Government to publish scientific evidence showing these steps will be safe.
Conor McArdle, northern regional schools lead for Unison, said: "It's potentially reckless and could cause chaos. The concern is that Covid will spread alarmingly in schools.
"Parents will be unsure what to do, and staff and pupils, who may not even know they have Covid, could spread it to vulnerable people.
"Schools have been open throughout and everyone wants a return to normal life.
"But we want the Government to keep free testing and the requirement to self-isolate as an absolute minimum.
"They should publish the evidence in full for the public to see if removing these rules will be safe."
Jim Kennedy, Unite national officer, added: "Once again the Prime Minister is disregarding working people's and the public's health - this time school staff, children and their families - through reckless measures meant only to please his backbenchers."
And GMB national officer, Avril Chambers, said: "You have to question the motive behind this reckless decision.
"We suspect it's yet another decision taken by this Prime Minister out of self-interest rather than for the good of the country.
"Support staff have kept our schools open throughout the pandemic. They deserve to stay safe and our children deserve not to have their education interrupted any more than it already has been.
"The Prime Minister needs to act responsibly. He must leave free tests and isolation requirements in place until there is scientific evidence that they no longer serve a purpose."
