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.

Still, Region of Waterloo Public Health officials have said they will get involved as soon as there's evidence of a single case.

You can jump to the timeline of cases in schools around the region.

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

Dec. 1: Officials identified a COVID-19 case in a staff member at Franklin Public School. They were last at school on Nov. 26. A staff member and a student cohort have been told to self-isolate.

A student cohort and some staff members have been told to self-isolate after a student tested positive at Hespeler Public School. That student was last in the building on Nov. 25.

Officials say a student at Forest Heights Collegiate Institute has tested positive for COVID-19. The student hadn't been in class since Nov. 26. Some staff members and a student cohort have all been told to self-isolate.

A staff member at Sir John A Macdonald Secondary School who was last at school on Nov. 26 has tested positive for COVID-19. Some staff members have been told to self-isolate.

A student cohort is self-isolating from Grand River Collegiate Institute after a student tested positive for COVID-19. A staff member is also self-isolating. The student was last at school on Nov. 25.

Nov. 30: Health officials said a student at Grand River Collegiate Institute tested positive for COVID-19. They were last at school on Nov. 18 and there were no high-risk contacts at the school.

A student at Meadowlane Public School had also tested positive for the disease. That student hadn't been to class until Nov. 20 and there were no high-risk contacts in staff or students.

A student cohort and a staff member are self-isolating at Eastwood Collegiate Institute after a student tested positive for COVID-19. Officials said the student was last in class on Nov. 20.

A student at Williamsburg Public School has also tested positive for COVID-19. They haven't been to school since Nov. 20. Some staff members and a student cohort have been told to self-isolate.

A staff member at Smithson Public School and Abraham Erb Public School have each tested positive for COVID-19. Both of the employees were last in their respective schools on Nov. 27.

Nov. 29: The WRDSB has confirmed another case in a student at Forest Heights Collegiate Institute. They were last at school on Nov. 19. Public health has identified and contacted one staff member and two students who are considered high risk contacts.

Three other schools--Galt Collegiate Institute, William G Davis Public School and Riverside Public School--reported another case of COVID-19 in students. One staff member at Eastwood Collegiate Institute also tested positive.

An outbreak was declared at William G Davis Public School in Cambridge after two positive COVID-19 tests were linked.

The Catholic school board also reported several cases of COVID-19: three more were reported in students at St. Bernadette CES, while St. Mary's High School and St. Michael Catholic Elementary School each reported one more case in a student.

Nov. 27: There is a new COVID-19 case confirmed in a staff member at Glenview Park Secondary School. Officials say they were last at school on Nov. 25. There are no high-risk contacts in students, and some staff have been told to self-isolate.

The WRDSB has also confirmed a case in a student at Forest Heights Collegiate Institute. They were last at school on Nov. 10 and there are no high-risk cases at the school.

Nov. 26: Health officials have confirmed that a staff member at Sandhills Public School tested positive for COVID-19. They were last at school on Nov. 18. Some staff members and a student cohort have been told to self-isolate.

Officials also said a student at Glenview Park Secondary School has tested positive for COVID-19. They were last in the building on Nov. 10. There are no high-risk contacts in the school.

Two student cohorts and a staff member have been told to self-isolate after a student tested positive for COVID-19 at Southwood Secondary School. The student was last at school on Nov. 19.

The Waterloo Catholic District School Board also reported three new cases on Nov. 26: a staff member at John Sweeney CES and one student at both Resurrection CSS and St. Boniface CES all tested positive for the disease.

Nov. 25: Health officials say a staff member at Wilson Avenue Public School has tested positive for COVID-19. They were last at school on Nov. 19. Some staff members and a student cohort have been told to self-isolate.

A student at Sir Adam Beck Public School also tested positive for COVID-19. Officials said there are no high-risk contacts at the school and the student was last at school on Nov. 13.

The Catholic school board also reported four new cases of the disease on Nov. 25. A student at St. Matthew CES, a staff member at St. Anne Catholic School in Kitchener and one of each at St. Bernadette were listed on the board's website.

Nov. 24: Health officials have identified a COVID-19 case in a student at Jean Steckle Public School. They were last at school on Nov. 19. High-contacts, concluding some staff members and a student cohort, have been told to self-isolate.

Officials also said a student at Preston High School had tested positive for the disease. They were last at school on Nov. 10 and there were no high-risk contacts at the school.

Officials reported a case in a student at Kitchener-Waterloo Collegiate and Vocational School. They were last at school on Nov. 20. Officials say a staff member, a bus cohort and a student cohort have been directed to self-isolate.

A student at Janet Metcalfe Public School has also tested positive for the disease and was last in the building on Nov. 20. Some staff members and a student cohort now need to self-isolate.

Nov. 23: A staff member at Woodland Park Public School has tested positive for COVID-19, according to health officials. There were no high-risk contacts in the school and the staff member was last in the building on Nov. 18.

Officials confirmed a case in a student at Preston Public School, who was last at school on Nov. 16. There are no high-risk contacts in the school, public health said in a news release.

Health officials also confirmed COVID-19 cases in three students at Floradale Public School. They were last in school on Nov. 13. Officials said there were no high-risk contacts in the school.

A student at Clemens Mill Public School also tested positive for the disease and was last at school on Nov. 13. Health officials have identified all high-risk contacts in staff and a student cohort, who have been directed to self-isolate.

A staff member at Alpine Public School has tested positive for the disease and was last at school on Nov. 20. Health officials have identified some staff members as high-risk contacts, but no students have been dismissed.

A staff member at St. Bernadette Catholic School also tested positive for COVID-19, officials reported on Nov. 23.

Nov. 22: A COVID-19 outbreak was declared at Centennial Public School after two students tested positive. Their tests come after a staff member had gone to school while infectious and awaiting test results.

A case has been reported at St. Michael Catholic Elementary School in Cambridge. According to the school, public health has identified one classroom of high-risk contacts. Those individuals are required to self-isolate at home.

Nov. 21: A student at Blessed Sacrament Catholic Elementary School has tested positive for COVID-19. This comes after an outbreak was declared at the school on Nov. 17. There are two cases listed at the school, according to Region of Waterloo Public Health.

The WRDSB reported that a student at William G. Davis Public School has tested positive for COVID-19.

Nov. 20: Public health officials confirmed a COVID-19 case in a student at Sir Adam Beck Public School, who was last in the building on Nov. 16. Officials also said another student, who was last at school on Nov. 17, is presumed positive. Any high-risk contacts are asked to self-isolate until Dec. 1 or 2.

The WRDSB reported that one staff member at Southwood Secondary School had tested positive on Nov. 20. It's the second case that's been reported this month at the Cambridge school.

Nov. 19: Public health officials confirmed two COVID-19 cases in students at Stewart Avenue Public School. The school board said the students were last at school on Nov. 9. There are no high-risk contacts at the school and no staff or students need to self-isolate, officials said.

Nov. 18: Catholic school board officials reported one case of COVID-19 in a staff member at John Sweeney Catholic School. It was the first case reported there to date.

Nov. 17: Health officials reported a student at MacGregor Public School has tested positive for COVID-19. They were last at school on Nov. 13, and all high-risk contacts are asked to self-isolate until Nov. 30.

There was also a positive case in a student at Elmira District Secondary School who was last in the building on Nov. 6. There were no high-risk contacts identified at the school, officials said.

A staff member at Centennial Public School in Waterloo tested positive for COVID-19 and was last at school on Nov. 17.

High-risk contacts, including staff members and student cohorts, should self-isolate until Dec. 2.

The WCDSB is reporting a case in a staff member at Blessed Sacrament Catholic Elementary School.

Nov. 16: Public health officials confirmed a COVID-19 case in a student at Waterloo Collegiate Institute, who was last in the building on Nov. 10. High-risk contacts are asked to self-isolate until Nov. 25.

Health officials also confirmed a case in a student at Westvale Public School. They were last in the building on Nov. 6. Officials say there were no high-risk contacts in the school, meaning no staff or students will need to self-isolate.

There were also two other COVID-19 cases reported in Catholic elementary schools. Our Lady of Grace reported a new case in a staff member, while St. Daniel CES reported one case in a student.

Nov. 15: The Waterloo Region District School Board said that one staff member at Sir Adam Beck Public School had tested positive for COVID-19. The Catholic school board also reported a case in a staff member at St. Mark Catholic Elementary School.

Nov. 14: The outbreak at Avenue Road Public School in Cambridge was declared over.

A positive test for COVID-19 was confirmed in a student at St. Teresa of Calcutta Catholic Elementary School in Cambridge.

Nov. 13: The WRDSB said a staff member at Elgin Street Public School had tested positive for COVID-19. They were last at school on Nov. 9. Any high-risk contacts are asked to self-isolate until Nov. 24.

Officials also reported a case in a staff member at Mary Johnston Public School. That staff member was last at school on Nov. 6. Public health says there were no high-risk contacts at the school, because there was no exposure to other staff or students during the infectious period.

Nov. 12: A student at St. Gabriel Catholic Elementary School tested positive for COVID-19. In a news release, the school said public health officials would be contacting high-risk contacts and asking them to self-isolate.

Nov. 11: The WCDSB reported another case of COVID-19 at St. Benedict Catholic Secondary School. It's the second case at that school in as many days.

Nov. 9: The WRDSB said two students at Lincoln Heights Public School have tested positive for COVID-19.

The school board said the two students haven't been at the school since Nov. 6. Health officials haven't declared an outbreak at the school. Any high-risk contacts, including staff members and students, have been asked to self-isolate and return to school on Nov. 24.

The school board also confirmed a case of COVID-19 in a student at Westheights Public School. They were last in class on Nov. 5. All high-risk contacts, including staff and students in the identified cohort, should self-isolate until Nov. 20.

The WRDSB also reported a case in a student at William G Davis Public School. Officials say they student was last at the school on Nov. 5, and any high-risk contacts should self-isolate until Nov. 20.

The WCDSB also reported a case of COVID-19 in a student at St. Benedict CSS, and another case in a student at Our Lady of Grace CES.

Nov. 8: The region’s public school board is reporting three COVID-19 cases at its schools.

A student at Lexington Public School in Waterloo has tested positive for the disease. The individual was last in the building on Nov. 6. This is the second COVID-19 case confirmed at the school this month.

Two other cases were also reported, including a staff member Abraham Erb Public School in Waterloo and a student at Galt Collegiate Institute in Cambridge.

Nov. 6: Health officials identified a COVID-19 case in a student at Lexington Public School. The student hasn't been in the school since Nov. 2.

All high-risk contacts have been asked to self-isolate until Nov. 17, the WRDSB said in a news release.

The region’s Catholic school board also reporting a COVID-19 case in a student at St. Mary’s High School.

Nov. 5: Health officials declared a COVID-19 outbreak at Avenue Road Public School after a second student in an identified cohort tested positive for the disease. The first case was reported on Oct. 31.

A staff member at Southwood Secondary School also tested positive for COVID-19, the school board said. They were last in the building on Nov. 2.

Health officials said anyone identified as a close contact should self-isolate until Nov. 16.

Nov. 2: The Catholic school board reported one case of COVID-19 in a student at St. Dominic Savio Catholic School on Nov. 2. It was the 11th case of COVID-19 reported in a Catholic school in the last month.

Nov. 1: Two more students in WRDSB schools tested positive for COVID-19, the school board confirms. Queensmount Public School and Huron Heights Secondary School both reported that one student had contracted the disease.

On the same day, the Waterloo Catholic District School Board also reported another case of COVID-19 at Our Lady of Grace Catholic Elementary School, the second in a staff member. It's not known if the latest case is related to the ongoing outbreak or not. Our Lady of Grace has had a total of four cases to date: two in students and two in staff.

Oct. 31: WRDSB has confirmed cases at two of its schools: one in a student at Manchester Public School and another in a student at Avenue Road Public School.

Oct. 30:  Public Health has COVID-19 declared outbreaks at Holy Spirit Catholic Elementary School in Cambridge.

Oct. 29: Region of Waterloo Public Health declared an outbreak at an Catholic elementary school in Kitchener. The outbreak at Our Lady of Grace CES was declared after two more cases in the same cohort as the case that was identifed on Oct. 23.

Public health officials also identified a staff member with COVID-19 at Lexington Public School. The staff member was last at the school on Oct. 26.

All high-risk contacts should self-isolate on Nov. 9.

Oct. 26: The Waterloo Catholic District School Board reported two more cases of COVID-19 at its schools: one in a student at Holy Spirit Catholic Elementary School, and another at St. David Catholic Secondary School.

Oct. 25: Public health officials were notified about a case of COVID-19 in a staff member at Our Lady of Grace School on Oct. 25.

Oct. 24: Waterloo Catholic District School Board confirmed a student at Saint John Paul II Catholic Elementary School tested positive for COVID-19. They say proper protocol is in place and staff and students can expect to return to school on Monday.

Oct. 23: The WRDSB reported a COVID-19 case in a student at Janet Metcalfe Public School. The student was last at school on Oct. 20. All high-risk contacts from their cohort should self-isolate until Nov. 3.

The Catholic school board confirmed a case in a student at Holy Spirit Catholic Elementary School on Oct. 23.

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.