Community Testing for Respiratory Infections

Community Testing Component: Inclusion: \- All community members are able to participate in the community testing component. Exclusion: \- There is no exclusion criteria and participants will not be excluded based on pregnancy status or age. For Component A: Inclusion: * All ages * AND Lives in service area of a recruitment center (i.e., within range of courier pick up) * AND Plans to remain living in a recruitment area for the next 2 years. Exclusion: * Inability to communicate in a language in which consent forms, materials, etc. are available * OR Incarcerated * OR Living in a congregate setting (e.g., assisted living, nursing home, university dormitories with shared bathroom and communal eating facilities) * OR Unable/unwilling to participate in planned data and specimen collections * OR Unable to comply with study procedures, as determined by study investigators * OR Participation in clinical trials of investigational agents for respiratory viral infections during the three months prior to enrollment and for the duration of the study. For Component B: Inclusion: Index case: * Detection of priority respiratory pathogen via laboratory or point-of-care test on the day of eligibility screening or in the previous 5 days, AND * Lives in service area of a recruitment center (i.e., within range of courier pick up), AND * Lives in a household with ≥1 other person and plans to remain in the household for at least the duration of specimen collection (i.e., 14 days), AND * Has not been hospitalized since the date of symptom onset. Household contacts: * Routinely sleep in the same household as index case and slept in household ≥1 night in the 7 days before index case symptom onset, AND * Plan to remain in the household for at least the duration of specimen collection (i.e., 14 days). Household: * There is ≥1 non-ill household member (i.e., asymptomatic and has not tested positive for the virus of the index case) on the day of eligibility screening or in the previous 5 days, * AND all symptomatic persons in the household had a symptom or diagnosis onset date on the day of eligibility screening or in the previous 5 days. Exclusion: Index case: * Lives in a congregate setting (e.g., assisted living, nursing home, university dormitories with shared bathroom and communal eating facilities) * Meet any A1 exclusion criteria Household contacts: * Has been hospitalized any time since date of primary case symptom onset * Meets any A1 exclusion criteria Household: * The enrollment visit occurs \>6 days after the first symptom onset of primary case * The primary case in the household is not enrolled * The primary case has been hospitalized any time after the date of symptom onset