More than 840,000 Kiwis caught the flu last year, but 3/4 of them would never have known they had contracted the highly contagious virus.

Data from the Southern Hemisphere Influenza and Vaccine Effectiveness Research and Surveillance (SHIVERS) study, which analysed 2,500 adults and children randomly selected from general practices in Auckland show that 1 in 5 people in New Zealand – and 1 in 3 Kiwis under 19 – were infected …