The facilities were simply not available before now. It doesn't involve self-contained test kits like pregnancy tests.
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The first of three new laboratories is expected to start operating over the weekend and will initially process around 800 samples, the government said.
The two other labs are currently being set up and will be opening soon.
This is all being done with the help of universities, research institutes and companies such as Boots, which are lending their testing equipment for use in the labs.
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It they're self-isolating because of a contaminated household, going back to that household isn't much use.