The government on Monday found 110 preliminary positive cases after locking down three buildings in Fanling, Aberdeen and Tai Po.
Around 2,700 residents of Block 5 at Dawning Views, Lei Tim House at Ap Lei Chau Estate and Kwong Yee House at Kwong Fuk Estate were tested for the virus.
Officials said two infections were found in Fanling, 69 in Aberdeen and 39 in Tai Po.
Six of the results from Tai Po were indeterminate.