Of the almost 2,000 samples, only 12 had antibodies, said Reinhard Berner from the University Hospital of Dresden, adding the first results gave no evidence that school children play a role in spreading the virus particularly quickly.
"This £1 billion catch-up package will help head teachers to provide extra support to children who have fallen behind while out of school," Prime Minister Boris Johnson said.
As schools struggle to keep pupils engaged during the pandemic, a kindergarten on Indonesia's Java island is getting pupils back in the classroom using makeshift transparent cubicles and also sending teachers on home visits with social distancing barriers.
Excited children greeted their friends and weary parents got used to early starts again as schools in several European countries reopened after a nearly two-month coronavirus break.
Students of New South Wales (NSW), the most populous state, and the northern state of Queensland began going back to school on a limited basis to lessen the risk of spreading the illness, state leaders said.
India on Sunday extended its nearly 2-month-old lockdown by two weeks after reporting nearly 5,000 new coronavirus cases , but said restrictions could be eased in low-risk areas to boost economic activity.
Students from the CBSE curriculum schools in the UAE have once again achieved outstanding results in the All India Secondary School (Class X) Examination held in March this year.
Ali Al Hosani, Director of the Sharjah Private Education Authority, said: “The issuance of the guidelines coincides with the approaching new academic year. Where students return to school after applying the distance learning system during the third semester of the 2019-2020 academic year and after a break of more than five months.
The educational institutions in Pakistan will begin reopening in phases from next week following a fall in new coronavirus case numbers, officials said, ending a long closure that led to exam cancellations and threw students' grades into chaos.
The British government was forced on Monday to abandon its policy for grading exams that were cancelled because of the coronavirus pandemic after protests by students and warnings that it threatened the career prospects of the most disadvantaged pupils.