COVID-19.The health authority said Wednesday that its saline “gargle test” is now available for adults. So long swabs: B.C. unveils new mouth-rinse COVID-19 test for kids The test involves swishing a saline solution in a person’s mouth for five seconds, then spitting it into a container and giving it to a public health worker.The tests are available at test collection centres in urban areas and anywhere tests are being collected in rural areas, officials said.Anyone taking the test must not eat, drink, smoke or brush their teeth for an hour beforehand.