A known HIV-positive status has to be reported when applying for residence permit, but it cannot serve as ground for denying the permit.
If the person refuses to be treated for HIV they can be expelled. An HIV-positive status, however, is not a ground for rejecting entry or residence, such a rejection would be unlawful discrimination based on health status under the Equal Treatment Act.
In some cases, the immigration authority requests further documentation like latest lab test results, statement from current doctor etc. to support the application. If the person receives a positive HIV-test result after entering the country, the HIV-positive status does not have to be reported, only when an application to renew the residence permit is submitted.