Same as no notice has been paid to the 200 outbreaks in schools in the last 4 weeks of term.
Just like some posters pay no notice to discussions on prior threads and choose to repeat the same incomplete / inaccurate information...
200 outbreaks quoted in the weekly surveillance reports include all respiratory infections, including flu (which is still in circulation and for which children act as primary vectors).
Specifically on COVID (from the SAGE papers):
Outbreaks in educational settings
• From 01/06/2020 to close on 20/07/20 there were 60 confirmed clusters or outbreaks in educational settings, 33 in primary schools, 15 in pre-schools/nurseries, 5 in secondary schools and 7 in schools serving children of mixed age groups (some of these settings serve children with special educational needs (SEN)).
• There were 292 new COVID-19 (confirmed and suspected) ‘situations’ linked to educational settings identified through HP Zone in total during this period. 232 (79%) of these did not meet the definition of a COVID-19 cluster or outbreak because they involved suspected cases that later tested negative for COVID-19, single confirmed cases, cases that did not have direct links to the educational setting, or finally situations where reported cases remain possible pending confirmation.
• For confirmed outbreaks as of 20/07/2020, the median number of confirmed cases in children has been 0 (range 0-9) and for staff members 2 cases (range 0-10).
• Swab testing of some (n=10) or all (n=7) exposed individuals was carried out in 17 of the 60 (28%) confirmed outbreak or cluster situations notified.
• There have been no reported hospitalisations in children since 01/06/2020, and 3 in total among staff members linked to educational settings.
• There has been 1 reported fatality, in a teacher working in a secondary school. This individual had a known epidemiological link (household) and had also carried out charitable work in the community before becoming unwell as a possible point of community exposure. There were no suspected or confirmed cases in the school in which they were working and no wider transmission in that setting is thought to have occurred.
assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/907593/s0647-phe-covid-19-situational-awareness-summary-sage-48.pdf
60 outbreaks over 7 weeks is not zero risk but the numbers are much lower than what we have seen in other workplace settings (let alone hospitals or care homes). A typical outbreak has involved 2 members of staff and no children.