It was in the direction of medical development is the right time, if you go the wrong direction of development of medicine, and that is a huge chemical and biological weapons of mass destruction
That's when the direction of medical development is right, and if the direction of medicine goes the right way, it's a chemical and biological weapon that's hugely lethal.
That's when the direction of medical development is right. If the direction of medical development deviates, it's a biological weapon with great killing power