RSV in Acute Respiratory Infection Surveillance Among Community-Dwelling Elderly Aged ≥50 Years in China

Inclusion Criteria

• •CRE-ARI group:
• •1. Male or female adults aged ≥50 years (calculated based on date of birth and date of visit).
• •2. Presence one of the following conditions of ARI case definition :
• •* At least two respiratory symptoms/signs within 48 hours prior to self-reporting OR
• •* At least one respiratory symptom/sign + one systemic symptom/sign within 48 hours prior to self-reporting
• •3. Provision of written informed consent by the participant or their legal guardian, in accordance with local EC (Ethics Committee) requirements.
• •CAI group:
• •2. Male or female adults aged ≥50 years or children aged\<5 years (calculated based on date of birth and date of visit).
• •3. In the household, apart from the index case(s), there are two or more members who meet the criteria (2) AND are willing to participate, regardless of whether these household members exhibit ARI symptoms.
• •4. Provision of written informed consent by the participant or their legal guardian, in accordance with local EC (Ethics Committee) requirements.