I believe it's the representative from Burma at the UN recently. But previously Hahsemi Rafsanjani, Speaker of the Iranian Parliament, 1988. The saying existed prior to that too.As one Iranian politician correctly pointed out, "Biological weapons are the poor man's Atomic bomb." One fine day, more people will die from mosquito bites than from bullets and missiles on the battlefield.
There are two reasons why no country will deploy biological warfare: Firstly, practically every state in the world (with the exception of a few minor countries and Israel) has signed the biological weapon convention, which prohibits the manufacture or storage of biological agents. Second, once biological agents are deployed, they are extremely difficult to control. Biological warfare as a military strategy is ineffective since, once released, biological weapons infect all humans without discrimination. Biological warfare, on the other hand, will be favored by non-state actors because of its low manufacturing cost, technology, and indiscriminate and destructive effect.Analogy of Nuke is not appropriate for control though the danger is similar . Nukes do not replicate /proliferate on its own like DNA, and purification of Uranium to weapons grade is a time consuming costly matter compared to relatively easy genetic engineering . So it will never be possible to control genetic engineering the same way IAEA does to Radio Active Material. It is relatively easy to make a dirty bomb! But regulation of genetic engineering is better than wild west attitude specially by countries such as China. Difficult thing is to get them understand anything from Biotechnology to IDR!
Non proliferation of man made Dangerous organisms can never be successful due to difficulty in monitoring due to relative ease in alteration to DNA in organisms.
It's not impossible to make an ethnic based bio-weapon. The recent advances in RNAi (RNA Interference) technologies are very versatile. These can be used in therapeutics to cure diseases as well as for unethical applications. Who knows what's carried out in secrecy.There are two reasons why no country will deploy biological warfare: Firstly, practically every state in the world (with the exception of a few minor countries and Israel) has signed the biological weapon convention, which prohibits the manufacture or storage of biological agents. Second, once biological agents are deployed, they are extremely difficult to control. Biological warfare as a military strategy is ineffective since, once released, biological weapons infect all humans without discrimination. Biological warfare, on the other hand, will be favored by non-state actors because of its low manufacturing cost, technology, and indiscriminate and destructive effect.

As one Iranian politician correctly pointed out, "Biological weapons are the poor man's Atomic bomb." One fine day, more people will die from mosquito bites than from bullets and missiles on the battlefield.