Norovirus excretion in an aged-care setting

Area of Science:

• Infectious Diseases
• Virology
• Public Health

Background:

• Norovirus is a leading cause of gastroenteritis outbreaks, particularly in vulnerable populations like the elderly.
• Understanding viral shedding dynamics is crucial for effective infection control measures.

Purpose of the Study:

• To investigate Norovirus genogroup II (GII) excretion patterns during a gastroenteritis outbreak in an aged-care facility.
• To determine the duration and rate of viral shedding in elderly residents.

Main Methods:

• Prospective investigation of Norovirus GII excretion in residents of an aged-care facility during an outbreak.
• Quantification of viral shedding over time using molecular methods.
• Calculation of viral decay rate and half-life.

Main Results:

• Norovirus GII viral shedding peaked during the acute phase of gastroenteritis.
• Viral shedding persisted for an average of 28.7 days post-symptom onset.
• The calculated daily viral decay rate was 0.76, with a corresponding viral half-life of 2.5 days.

Conclusions:

• Norovirus GII can be excreted for extended periods in elderly individuals, even after the acute illness phase.
• Prolonged viral shedding necessitates sustained infection control interventions in aged-care facilities to prevent transmission.
• The determined viral half-life provides valuable data for epidemiological modeling and outbreak management strategies.