So some posters choose to live their lives as normal. In the course of this they may become infected. They will not know for a week, and even then as young and fit they may have few or no symptoms and may be genuinely unaware that they are infectious. Over their infectious phase they are likely to have passed it on to a hundred or more other people, some of whom for reasons of age, health or genetics become seriously ill, possibly for
for months.
No man is an island, etc.