Magnetic Island residents who waited in line up to eight hours for a COVID-19 test are worried they have been exposed to the virus in long queues.
About 2,500 people are on Magnetic Island: 1,200 people have been tested over two days.
But Susan Nolan was frustrated at having to wait so long for a test, after first lining up on Tuesday evening and then again on Wednesday without success.
"We were there at 10 o'clock yesterday morning, and at 7:20pm at the front of the queue last night we were turned away."
Ms Nolan was back in the line again today.
Blanche D'Anastasi said she waited for eight hours on Wednesday and five hours on Tuesday, but the booth closed before she could be tested.
"I stood beside a woman who was on a high-risk Virgin flight."
Ms D'Anastasi said there needed to be a triage system for higher-risk contacts to be kept separated from others getting tested.
The island went into lockdown on Tuesday after the positive case of a Brisbane-based hospital worker, who travelled to the region.
Townsville Hospital and Health Service chief executive Kieran Keyes said testing capacity was expanded on Magnetic Island, with extra staff sent over earlier in the week.
Mr Keyes said demand for tests was 14 times higher than usual and acknowledged the wait times were "unacceptably" long.
A local doctor on Magnetic Island also expressed his disappointment with the slow speed of vaccine rollout in the region.
Extra testing capacity in Townsville
An additional drive-through coronavirus testing facility has opened in Townsville this morning.
It was the third drive-through testing centre to open, but will be operated by Sullivan Nicolaides Pathology with help from Townsville City Council, rather than Queensland Health.
Mr Keyes has urged people who have symptoms and those who were at the known exposure sites to be tested as a matter of priority but said all others should wait.
