Biological warfare has been used to wage warfare both traditional and psychological for a long time. Many tribal groups within North America and the ancient Sarmatians dipped their arrows in snake venom.
crushed ants/spiders have been used.
A gross example is a tribe of Nevada which placed blood in a section intestine and buried it for a few days to rot before coating arrows.
Grim stuff. Not quite what I think of as biowarfare, I would call it chemical warfare using organic compounds from organisms - with exception for the last Nevada example which is biowarfare. I assume that the biowarfare labs around the world are primarily looking at contagious weapons with the direct use of viral or bacteriological organisms that can kill many people.
I dont know what gov’s have in store for the next 50 years. And because I dont know, makes me think I dont know what they have cell concocted the next 75.