Queensland has recorded three new local cases of COVID-19 amid a three-day snap lockdown of most of the state’s biggest cities.

Millions of people in southeast Queensland, Townsville, Magnetic Island and Palm Island are in lockdown on Wednesday after a 19-year-old Sandgate woman who has the Delta strain of the virus visited those communities while infectious last week.

Premier Annastacia Palaszczuk announced that all new cases are close contacts of existing cases.

One is the Sandgate woman’s teenaged brother, another is a person linked to a cluster at a Portuguese restaurant at Ellen Grove and a third close contact of a Virgin flight attendant.

“So we are considering these low risk, so this is very good news,” the premier told reporters.

“But it does give our health officials the time they need to do the contact tracing which is wonderful news.”

A partial lockdown covers residents of Brisbane, Ipswich, Logan City, Moreton Bay, Redlands, Sunshine Coast, Noosa, Somerset, Lockyer Valley, the Scenic Rim, the Gold Coast, Townsville, Magnetic Island and nearby Palm Island until 6 pm on Friday.

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Residents in those areas are only be allowed to leave home to shop for essential items, exercise, or receive or give medical care.

Masks remain mandatory and other restrictions have also been tightened including limiting funerals to 20 people, and weddings to 10 people, including the celebrant and couple.

AAP.