Following up on this separately from the daily news threads:
The incidents involves 30 cases that were initially confirmed by the private laboratory as 29 preliminary positive and 1 "indeterminate" cases. The test results from these specimens collected on April 20 showed that the viral load of the specimens was low (Ct values were mostly higher than 30).
The specimens were sent to the Public Health Laboratory Service Branch (PHLSB) of the DH for confirmation test in accordance with established practice. Among these 30 preliminary positive cases, 21 of them were local cases from multiple districts in Hong Kong with no clustered pattern or epidemiological linkage.
Some of the patients admitted to the Hospital Authority for isolation were subsequently tested negative for virus and serology testing, there is a possibility that these persons have not contracted the virus at all.
In addition, the same service provider is also involved in two confirmed cases announced earlier by the Centre for Health Protection (CHP) in which the persons returned from the Mainland in early April and a preliminary positive case announced on April 17 that involved a kindergarten teacher who was tested with "indeterminate" result by the PHLSB upon the confirmation test (Ct value at 31). These persons were tested again with negative results after admission to hospitals. They were also tested negative for antibody test.
The incident mainly involved specimens collected from community testing centres (Siu Lun Community Hall and Ngau Tau Kok Road Sports Centre), mobile specimen collection stations (Yau Oi Estate in Tuen Mun and Sha Tsui Road Playground) on April 20, and specimens collected at a quarantine hotel.From: https://www.info.gov.hk/gia/general/...1042200972.htmIn view of initial finding that there is a high possibility that the aforementioned cases pertain to "false positives", if the affected persons have been tested negative during isolation and tested negative for antibodies to COVID-19, they will be discharged from the hospital. Close contacts of these cases who were sent to quarantine facilities will also be allowed to leave the quarantine facilities if they are tested negative.