Answer: it was too small to be seen by optical microscope unlike many bacteria
Explanation:
The disease formerly referred to as Russian flu' before it was later known as the 'Spanish flu' was considered as acts of god in 1918.
It was first thought that the causative agent was Pfeiffers bacillus. Alas, they were wrong. It was caused by VIRUS.
The disease caused the destabilization of social and political orders for decades.
They later cultured the virus from diseased tobacco leaves.
Because second hand smoke can and will affect the lungs of everyone who is around, not just the smokers
