In a lateral flow test, fluid is taken in a swab of the nose or the throat and applied to a piece of absorbent paper that will change colour to indicate whether or not the virus is present.
from TV Aerials Huddersfield News https://www.dailymail.co.uk/news/article-9080705/Tens-millions-30-minute-virus-swabs-set-sent-out.html?ns_mchannel=rss&ito=1490&ns_campaign=1490
via TV Aerials Brighouse
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