Nearly two-and-a-half years into the Covid-19 pandemic, countries where mask-wearing is a cultural norm are seeing some signs of success, RNZ reports. While several infection-control specialists have warned that fatigue around Covid-19 control measures is likely contributing to the spread of Omicron in both Australia and New Zealand, epidemiologist Hassan Vally said wearing masks was just one example of how cultural differences were contributing to Covid-19 success in some Asian countries.