Table 1.
Effect of intervention scenarios on contact rates and infectiousness of clinically infected individuals
| Home contacts | Work contacts | School contacts | Other contacts | Infectiousness of clinically infected individuals | |
|---|---|---|---|---|---|
| Baseline | 100% | 100% | 100% | 100% | 100% |
| School closures | 100% | 100% | 0% | 100% | 100% |
| Physical distancing | 100% | 50% | 100% | 50% | 100% |
| Shielding of older people | 100% | 25% (≥70 years); 100% (others) | 100% | 25% (≥70 years); 100% (others) | 100% |
| Self-isolation | 100% | 100% | 100% | 100% | 65% |
| Combined* | 100% | 25% (≥70 years); 50% (others) | 0% | 25% (≥70 years); 50% (others) | 65% |
| Intensive interventions | 100% | 25% (≥70 years); 65% (others) | 100% (schools open); 0% (schools closed) | 16% (≥70 years); 59% (others) | 65% |
| Lockdown | 100% | 10% | 10% (schools open); 0% (schools closed) | 10% | 65% |
Data are the percentages of contact rates or individual infectiousness remaining after each intervention; each intervention was assumed to affect either a component of the contact matrix or the infectiousness of clinically infected individuals, reducing it to the percentage shown. Where interventions include shielding of older people, percentages of contact rates are given separately for people aged 70 years or older and all other people.
*
School closures, physical distancing, shielding of older people, and self-isolation combined.