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Amidst concerns that school re-openings may cause a second wave of Covid-19, lead author Dr Jasmina Panovska-Griffiths (×î×¼µÄÁùºÏ²ÊÂÛ̳ Applied Health Research) explains the findings of a joint study by ×î×¼µÄÁùºÏ²ÊÂÛ̳ researchers and the London School of Hygiene and Tropical Medicine on contact tracing