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"Stealth" strains of gonorrhoea that fail to show up in tests are on the rise across the world, researchers have discovered, because the tests used by doctors to identify the bacteria look for an enzyme no longer present in those strains.
The rising prevalence of these strains was found in Australia, New Zealand, England, Scotland and Denmark. The findings should prompt clinics to change practice and use at least two tests that work in different ways to detect the infection, the scientists say.