The 1928 Flu never died down completely. It will further mutate and return. The last attack was probably ib 1957 It was called Mao or Hong Kong Flu. Pakistan has recovered at a very fast pace because of 4 reasons:
1. Unhealthy and dirty living conditions
2. Non consumption of pork
3.Lesser consumption of Alcohol
4. Abundant use of spices in food.
All the above enhance immunity