Tuberculosis in New Zealand: Annual Report 2016

Wednesday 18th September 2019


Summary

This report describes the epidemiology of tuberculosis in New Zealand for 2016 as well as trends during the past 5–10 years.
Tuberculosis disease (TB) is a notifiable condition in New Zealand. The TB notification rate has been relatively stable since 2007 apart from a small decrease recorded in 2013. The 2016 TB notification rate was 6.3 per 100,000 population (294 cases). The majority of TB notifications were for new disease, with relapse/reactivation cases making up a small number of notifications. A high proportion of TB cases (86.7%) were laboratory confirmed. 

The highest notification rates in 2016 were recorded for Counties Manukau, followed by Auckland and Hawke's Bay DHBs.

Between 2012 and 2016, there was a similar pattern in the demography among new TB cases. Rates were higher in males than females, especially those aged 15–39 years. Over the past 5 years, the Asian ethnic group has consistently experienced the highest notification rates. Although the absolute number of cases remains relatively low, the next highest rates were recorded in the Middle Eastern/Latin American/African (MELAA) ethnic group up until 2015 when the rate in this group was surpassed by the rate in the Pacific peoples ethnic group. As in previous years (2007–2016), higher rates of TB occurred in socioeconomically deprived areas.

Not being born in New Zealand and current or recent residence with a person not born in New Zealand have consistently been dominant risk factors.

Four (1.7%) of the culture-positive TB cases reported in 2016 were multidrug-resistant TB (MDR-TB, defined as resistance to at least isoniazid and rifampicin). All four of these MDR-TB cases were born overseas. Resistance to isoniazid, rifampicin, ethambutol and streptomycin was higher among isolates from cases born overseas than among isolates from New Zealand-born cases, but only streptomycin resistance was significantly higher (p = 0.028).

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Report:

Tuberculosis in New Zealand: Annual Report 2016

 

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Tuberculosis in New Zealand: Annual Report 2016

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