![](https://www.scotsman.com/jpim-static/image/2024/07/26/10/46/GettyImages-1212056096.jpg?width=1200&auto=webp&quality=75&crop=3:2,smart&trim=)
Covid, influenza and HIV all caused pandemics because of this one key thing
When Covid hit, it took too long to establish how many cases were being caused by people who were infected but showed no symptoms "It is not a question of 'if' another pandemic will strike but 'when'. The evidence is overwhelmingly to …