Table. Description of the 5 Simulations.

Scenarios	Description
Stringency of mitigation measures
1. Constant low level of transmission	Individuals obey social distancing strictly and have constant low contact rate from March 2020 to March 2021
2. Sudden decrease + gradual increase in transmission	Mitigation measures are most strict at the beginning and are gradually relaxed between March 2020 and March 2021
3. Decrease in nonhousehold contacts	Stay-at-home orders from late March 2020 to late June 2020 reduced contact opportunities in nonhousehold settings by 82% and increased household contacts by 10%
Factors associated with the reemergence of RSV epidemics
4. Importation of external infections	Introduction of the virus from other regions may ignite RSV epidemics
5. Decrease in the duration of protective maternal immunity	Absence of RSV epidemics leads to lack of boosting of maternal immunity

Abbreviation: RSV, respiratory syncytial virus.