> Overall, 102,473 (16%) of the 638,125 people invited consented and completed at least one questionnaire: 33,281 (20%) of the 162,957 people who had a positive

> Overall, 102,473 (16%) of the 638,125 people invited consented and completed at least one questionnaire: 33,281 (20%) of the 162,957 people who had a positive test, and 69,192 (15%) of the 475,168 invited following only negative tests. That still looks like a pretty poor response rate.