What does this research mean for the field?

An early-season outbreak of Influenza A(H3) in a highly vaccinated nursing home population resulted in a 23% attack rate, with a mild clinical course characterized by an 8% hospitalization rate and zero mortality. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate attack rates, clinical manifestations, and health outcomes during an early-season Influenza A(H3) outbreak among nursing home residents.

August 23, 2026BMC Public HealthOpen Access

An outbreak report of Influenza A(H3) among residents of a large nursing home in northern Italy: attack rates, clinical features and outcomes

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Authors

FFFederico FondaUniversity of Udine AFA FaruzzoUniversity of Udine GBGabriella BelliniAzienda di Servizi alla Persona di Pavia (Italy)

Discussion

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Implication

Outbreak report reveals a 23% attack rate and zero mortality for influenza A(H3) in nursing home residents, highlighting the need for early seasonal surveillance.

Key Points

To evaluate attack rates, clinical manifestations, and health outcomes during an early-season Influenza A(H3) outbreak among nursing home residents.
Conducted prospective acute respiratory infection surveillance among residents in a 375-bed nursing home in northern Italy during November–December 2025.
Tested nasopharyngeal swabs for Influenza A(H3) in all acute respiratory infection cases and calculated attack rates, case-hospitalization rates, and case-fatality rates following ORION guidelines.
Among 217 residents (median age 88 years, 83% vaccinated), 50 developed laboratory-confirmed Influenza A(H3), resulting in an attack rate of 23% (95% CI: 17.6–29.2%).
Most frequent symptoms were fever (89.8%) and cough (81.6%), with a median symptom duration of 3 days (range: 1–14 days).
The case-hospitalization rate was 8% (4/50; 95% CI: 2.2–19.2%) and the case-fatality rate was 0.0% (0/50; 95% CI: 0.0–7.1%).

Cite This Study

Fonda et al. (2026) studied this question.

synapsesocial.com/papers/6a8aae407677a3411444714e https://doi.org/10.1186/s12889-026-28934-5

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Implication

Outbreak report reveals a 23% attack rate and zero mortality for influenza A(H3) in nursing home residents, highlighting the need for early seasonal surveillance.

An outbreak report of Influenza A(H3) among residents of a large nursing home in northern Italy: attack rates, clinical features and outcomes

Discussion

Member takes

Implication

Key Points

Cite This Study

An outbreak report of Influenza A(H3) among residents of a large nursing home in northern Italy: attack rates, clinical features and outcomes

Discussion

Member takes

Implication

Key Points

Cite This Study

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