The testing is being carried out in Stenhousemuir Primary School and Larbert High School – as well as Banchory Primary School in Tullibody.
According to the Test and Protect team the initial information suggests the virus was contracted outside of the schools and there is no evidence at this stage of any transmission within the school premises.
The individuals, not named due to patient confidentiality, who have tested positive for the virus are self-isolating at home along with the rest of their household.
Close contacts of the individuals have been identified and advised to self-isolate.
Robust control measures were already in place and both Stenhousemuir Primary and Larbert High will remain open.
David Mackay, Head of Education at Falkirk Council said: “We want to reassure parents and carers we follow the strict Scottish Government and NHS guidelines regarding hygiene and are working closely with NHS Forth Valley’s Public Health team."
NHS Forth Valley consultant Dr Jennifer Champion said: “Apart from those who have been identified as close contacts, all other staff and pupils can continue to attend these schools as normal and do not require to self-isolate or book a test.
“We have seen a recent concerning rise in cases across Scotland, including in Forth Valley, and it’s therefore important that we all stick to the guidelines to stop this virus spreading any further or faster in our local communities.”