The Housing Department will fence off open space where crows gather at Lai On Estate in Sham Shui Po for disinfection.
The move follows a suspected case of H5 avian influenza involving a crow found dead there earlier this week.
The number of wild house crows congregating in the area has dropped from over 400 to 200 during the last six months after the trimming of overgrown trees, playing sound devices, deploying security guards to point torches at trees or using other methods of illumination, placing bait on roof-tops of housing blocks and banning the tree trunks with wooden plank to frighten away the birds.
Over the past two weeks, the department has found 122 dead birds at public rental housing estates. Staff from the Agriculture, Fisheries & Conservation Department have collected them for tests.
Cleansing contractors have increased the frequency of clean-ups and disinfection of open space frequented by wild birds or crows to three or four times daily.
The department said the most effective way to deal with feral bird nuisances is to avoid feeding birds to prevent them congregating and roosting near the housing blocks.
Bird feeders will be served a $1,500 fixed penalty notice and receive five penalty points under the Marking Scheme for Tenancy Enforcement when caught.
As at the end of January, 10 offenders have been served with fixed penalty notices for feeding feral birds.
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