KITCHENER -- Students in Waterloo Region were able to return to the classroom in early September, with staggered starts across different school boards designed to reduce the number of students learning new protocols at the same time.

Regional and provincial public health officials have both said cases in schools are all but inevitable. According to public health guidance, a school will declare an outbreak if there are two or more cases of COVID-19 with an epidemiological link, but Region of Waterloo Public Health officials say they will get involved as soon as there's evidence of a single case.

You can jump to the interactive map of all known cases around the region.

Here are the cases of COVID-19 reported in Waterloo Region schools to date:

Oct. 21: There was a COVID-19 case confirmed in a student at Tait Street Public School. The student hasn't been to class since Oct. 13. High-risk contacts in the identified cohort should self-isolate until Oct. 27 and will be contacted by public health.

Oct. 20: The WRDSB said a student at Wilson Avenue Public School has tested positive for COVID-19 and was last in the building on Oct. 8.

Any high-risk contacts in the identified cohort should self-isolate until Oct. 22, according to public health.

Oct. 19: Public officials said a student at Galt Collegiate Institute has tested positive for COVID-19. That student was last at school on Oct. 13. All high-risk contacts in the identified cohort should self-isolate until Oct. 27, health officials say.

Oct. 18: A student at Resurrection Catholic Secondary School tested positive for COVID-19. According to the Waterloo Catholic District School Board, the student was last in the building on Oct. 8, and all high-risk contacts have been contacted. The Waterloo Region District School Board reported a case of COVID-19 in a student at Westmount Public School in Kitchener.

Oct. 15: Keats Way Public School announced that one of its students had tested positive for COVID-19. The school said that the student hadn't been at school since Oct. 2, and that public health had identified no high-risk contacts.

There was also a COVID-19 case confirmed in a student at Cameron Heights Collegiate Institute. The WRDSB said the student was last in the building on Oct. 14. All high-risk contacts in the identified cohort have been contacted and should self-isolate until Oct. 28.

Oct. 14: The Waterloo Region District School Board reported a case of COVID-19 in a student who goes to Elmira District Secondary School. The student was last in the builindg on Oct. 7. High-risk contacts have been dismissed and asked to self-isolate until Oct. 21.

Oct. 13: Officials with the Waterloo Catholic District School Board reported two cases of COVID-19 at St. Margaret of Scotland Catholic Elementary School.

Public health officials also confirmed a student at Waterloo Collegiate Institute. The student was last at school on Oct. 8, the WRDSB said. High-risk contacts from the identified cohort should self-isolate until Oct. 22.

Later on in the day, officials reported a case at Groh Public School in Kitchener. In that case, the infected student had not been in the school since Oct. 9. Those from their cohort considered high-risk are advised to self-isolate until Oct. 23.

Oct. 10: An outbreak has been declared at JF Carmichael Public School in Kitchener after two students tested positive for COVID-19. The outbreak was declared over on Oct. 16.

Oct. 8: A student at Waterloo Collegiate Institute has tested positive for COVID-19. The WRDSB said the student hasn't been in the building since Oct. 2. High-risk contacts in the identified cohort should self-isolate until Oct. 16.

Oct. 6: The WRDSB said a student at Eastwood Collegiate Institute has tested positive for COVID-19. The student was last in the school on Sept. 28. Public health officials said all high-risk contacts in the student's cohort should self-isolate until Oct. 12.

Health officials also reported another case at Huron Heights Secondary School. This is the fifth student who has tested positive at the school to date, but there is no epidemiological link between the cases, according to public health officials.

Oct. 5: Another student has tested positive for COVID-19 at Huron Heights Secondary School. The student was last in the building on Sept. 25 and there are no high-risk contacts identified inside the school.

It's the fourth COVID-19 case to date at the school. Public health has not declared an outbreak. A spokesperson for the WRDSB said there is no epidemiological link between any of the cases.

Oct 3: Two cases have been reported at French Catholic school École élémentaire catholique Cardinal-Léger in Kitchener and an outbreak has been declared.

The COVID-19 outbreak at Kitchener Collegiate Institute has been declared over.

Oct. 2: Public health officials confirmed a student at Huron Heights Secondary School had tested positive for COVID-19 and was last in the building on Sept. 18. Public health officials said a cohort was potentially exposed to the case during the infectious 14-day period, but because it was only told of the case recently, no further isolation is required. Officials will be calling families of students in the identified cohort to follow up.

This is the third student reported at the school so far with a COVID-19 case. The first was reported on Sept. 21 and the second on Oct. 1. Region of Waterloo has not declared an outbreak at the school.

Oct. 1: The WRDSB confirmed a student at Huron Heights Secondary School had tested positive for COVID-19. The student was last in the school on Sept. 25. Health officials have told all high-risk contacts in the cohort to self-isolate until Oct. 10.

Sept. 30: The WRDSB reported a COVID-19 case in a student at Conestogo Public School. Health officials haven't identified any high-risk contacts in the school and the student hasn't been to class since Sept. 18.

Sept. 29: Public health officials confirmed a COVID-19 case in a staff member at Moffat Creek Public School. The WRDSB said the identified cohort and some other staff members have been told to self-isolate by public health. The staff member hasn't been at the school since Sept. 25. Public health will contact any close contacts.

Sept. 25: Public health officials declared a COVID-19 outbreak at Kitchener-Waterloo Collegiate and Vocational School after a staff member tested positive for the disease. The WRDSB said the staff member was in the same cohort as the student who had a confirmed case earlier in the week. The school will remain open.

Sept. 23: A student at St. David Catholic Secondary School tested positive for COVID-19. The Waterloo Region District Board also reported another case of COVID-19, this time at Kitchener-Waterloo Collegiate and Vocational School.

Sept. 22: Two students at Cameron Heights Collegiate Institute have tested positive for COVID-19. The school board said they haven't been in the school since Sept. 16 and there are no high-risk cases in the school.

There was also a confirmed case announced at Forest Hill Public School. There are no high-risk school contacts associated with that case, and the student hadn't been at school since Sept. 14.

The WRDSB identified a COVID-19 case in a student at Preston High School. The student was last in class on Sept. 16. The student's cohort and some bus riders have been told to self-isolate until Sept. 30.

Sept. 21: The WRDSB reported a case in a student at Cambridge's Clemens Mills Public School. The student was last at the school on Sept. 14 and there are no high-risk school contacts.

There is also a confirmed case at Forest Heights Collegiate Institute. That person was last at school on Sept. 15. Public health officials haven't identified any high-risk school contacts associated with the case.

The WRDSB reported another student COVID-19 case, this time at Huron Heights Secondary School in Kitchener. The student was last in the building on Sept. 17.

The school board also reported a case at Williamsburg Public School. The student was last in the building on Sept. 18.

Sept. 20: The Waterloo Region District School Board reported its first student case of COVID-19, with a positive case identified in a child at Riverside Public School.

Sept. 16: A kindergarten student at St. Anne Catholic Elementary School in Cambridge tested positive for the disease, forcing the entire class to self-isolate and get tested. Chantele Ristovksi says her daughter, five-year-old Olivia, was in the class where the infection was discovered.

Sept. 6: Before schools had even reopened, a staff member at Waterloo's Edna Staebler Public School tested positive for the novel coronavirus. The Waterloo Region District School Board said the school was closed for extensive cleaning before reopening after the Labour Day long weekend.

MAP OF ALL COVID-19 CASES