Current Pandemic Situation New Zealand Mark Jacobs Mark Jacobs Director of Public Health Director of Public Health Ministry of Health Ministry of Health New Zealand

OVERALL OVERALL  General increase in recent weeks  So far tracking seasonal flu year  Pandemic strain remains dominant  Managed through business as usual processes, no reestablishment of NHCC  Annual seasonal vaccination program continues, higher than usual uptake  Confirmed cases- 35  Hospitalised- 19  ICU- 2  Deaths- 1

ILI in Primary Care

ILI calls to Healthline

Isolates

School Absenteeism

Assessing Severity  No new/special systems, will use existing mechanisms. Changes in-  ILI presentations in primary care  Burden on hospitals  Absenteeism  Proportion of cases needing intensive care  Average length of stay in ICU  Clinical picture  Mortality rates  Causes of death  Risk factors/demographics  Virus (eg antiviral resistance)

Seroprevalence Study  Large representative national sample, after first wave (Nov 09- Mar 10)  Examined population seroprevalence, plus health care workers  Overall community seroprevalence 26.7% (29.5% when standardised to NZ population)  Significant age group differences- highest in 5-19 years (46.7%)  Significant ethnic group differences- Pacific (49.5%) and Maori (36.9%) higher than others  45.2% of seropositive individuals had no history of ILI  no significant difference in seroprevalence between primary or secondary health care workers and general community  Allows estimate of total symptomatic cases in first wave, and so better estimates of case fatality rate (8.2 per 100,000) and hospitalisation rate (262 per 100,000)