| Timepoint | ||||||||
---|---|---|---|---|---|---|---|---|---|
Data collection period | P0 (Baseline) | P1 | P2 | P3 | P4 | P5 | P6 | P7 | P8 |
Week of study | 1–3 | 3–4 | 5–6 | 7–8 | 9–10 | 11–12 | 13–14 | 15–16 | 17–18 |
Month | April | May | Â | June | Â | Â | July | Â | Aug |
Long survey • "In the last two months" | x |  |  |  | x |  |  |  | x |
Short survey • "In the last two weeks" |  | x | x | x |  | x | x | x |  |
Antibody test | Â | Â | Â | Â | Â | x | Â | Â | Â |