Who is defined contact of diagnosed person
5.—(1)  For the purposes of these Regulations, an individual is a defined contact of a diagnosed person if, at any time during the look‑back period applicable to the diagnosed person, the individual is ordinarily resident in a place of accommodation that the diagnosed person ordinarily also resides in when the diagnosed person is or became a diagnosed person.
(2)  The look‑back period applicable to a diagnosed person means —
(a)in the case where he or she is a diagnosed person because of having been tested positive for SARS‑CoV‑2 upon undergoing a PCR test in Singapore — a period of 7 days before the date on which the diagnosed person so tested positive for SARS‑CoV‑2 and ending on the day the diagnosed person so tested positive for SARS‑CoV‑2; or
(b)in the case where he or she is a diagnosed person because of having been diagnosed as having a COVID‑19 infection — a period of 7 days before the date on which the diagnosed person was so diagnosed and ending on the day the diagnosed person was so diagnosed.
(3)  To avoid doubt, a look‑back period can consist of any time falling before 15 September 2021.
(4)  Without limiting the ordinary meaning, an individual is treated as ordinarily resident, during the look‑back period applicable to a diagnosed person, in a place of accommodation that the diagnosed person ordinarily also resides in if the individual had, at any time during that look‑back period —
(a)stayed in the place of accommodation as a domestic worker or tenant, even if there was no face‑to‑face interaction with the diagnosed person;
(b)stayed as a lodger or resident in any part of the place of accommodation with shared facilities (such as a communal living room, bathroom, laundry or kitchen) which the diagnosed person may have used, even if there was no face‑to‑face interaction with the diagnosed person; or
(c)stayed in the place of accommodation overnight at least once, even if there was no face‑to‑face interaction with the diagnosed person.