Annual Summary of Outbreaks in New Zealand, 2009

Wednesday 29th September 2021

Summary of outbreaks in 2009

There were 638 outbreaks reported during 2009 involving 10 734 cases. A total of 337 cases required hospitalisation and 21 cases died.

The highest number of outbreaks was reported by Auckland Public Health Unit, which represented 37.1% (237/638) of all outbreaks in 2009.

Institutional outbreaks were the most common outbreak type, followed by household outbreaks.

The causal agent (pathogen, toxin or chemical) was identified in 72.1% of outbreaks.

Enteric agents were implicated in 91.8% of outbreaks. The most commonly identified pathogen was norovirus, followed by Giardia spp. and rotavirus. The most commonly implicated non-enteric agent was Bordetella pertussis.

The most common settings where exposure or transmission occurred were rest or retirement homes and the home environment.

Person-to-person transmission accounted for 84.6% of outbreaks in 2009. Multiple modes of transmission were implicated in 30.6% of outbreaks.

The most commonly implicated food type in outbreaks associated with a foodborne mode of transmission was poultry, followed by vegetables (root), shellfish, grains/beans and fish.

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Annual Summary of Outbreaks in New Zealand, 2009



Annual Summary of Outbreaks in New Zealand, 2009

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