They are all posted at the Border Security Force (BSF) frontier headquarters in Umpling, which has been declared a containment zone.
A senior health official said more tests will be conducted among the BSF personnel.
Around 300 personnel and their families reside within the campus, while nearly 50 personnel along with their families live outside the compound, a BSF official said.
The state now has 121 active COVID-19 cases, the chief minister said.
So far, 45 patients have recovered from the disease. JOY SOM
DPB DPB