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Comparison of three contact characteristics between community-based working and different types of healthcare workers: physical and non-physical; periodicity of contacts (whether they met this contact daily, weekly, and monthly or less); and the duration of contact (≥1 h, ≥15 min, ≥5 min, and all contacts shown in light blue, dark blue, green and orange respectively). Each circle represents a square-root contact number of 0.5.
