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It is difficult to reconcile the findings of that study with what is happening in US, UK, Ireland and many other countries in Europe. If you read the whole study you will see where they mention the limitations of it.
“This study has several limitations that need to be discussed. First, this was a cross-sectional screening programme, and we are unable to assess the changes over time in asymptomatic positive and reoperative results.”
“Second, although a positive result of nucleic acid testing reveals the existence of the viral RNAs, some false negative results were likely to have occurred,”
Also they note that “Previous studies have shown that asymptomatic individuals infected with SARS-CoV-2 virus were infectious, and might subsequently become symptomatic………”