Scientists cracked the code for a drug resistant form of the plague in 2007 already, according to The Guardian. That means drug resistant plague bacteria can be bioengineered in labs and put in circulation.
From The Guardian 2007
A multiple drug-resistant form of the plague, one of the oldest and most lethal diseases in human history, has been identified by scientists, prompting fears of devastating future outbreaks that cannot be contained by antibiotics.
Tests on a strain of the disease-causing bacterium, Yersinia pestis, taken from a 16-year-old boy in Madagascar revealed the organism has developed resistance to eight antibiotics used to treat the infection, including streptomycin and tetracyclin.
The bacterium is believed to have become resistant to drugs after swapping genes with common food bacteria such as salmonella, E coli and klebsiella, probably while being carried in the guts of fleas, which spread the disease by biting infected rodents.
The discovery has alarmed scientists who fear multiple drug-resistant strains of the plague may emerge in other countries, leading to highly dangerous pandemics which spread rapidly. Another serious concern is that drug-resistant strains of the organism may be collected by terrorist organisations and released into the air, causing widespread infection.
The plague first emerged several thousand years ago and swept across Asia and Europe during the Black Death pandemic between the 14th and 17th centuries. Successive pandemics are estimated to have claimed some 200m lives. Antibiotics brought the disease under control, but in recent decades the World Health Organisation has recorded outbreaks in 25 countries, most recently in the Democratic Republic of Congo, which last year reported 1,174 suspected cases and 50 deaths.
There are two forms of plague. Infections caused by bites lead to bubonic plague, named after large swellings or buboes on the skin. Untreated, it kills 40% to 70% of people, usually in less than a week. The second form, pneumonic plague, is almost 100% fatal within days if not treated.
The last fatal case of the plague in England was at the end of the first world war, when a Mrs Garrod died on June 19 1918 in Suffolk, a week after a neighbour, Mrs Bugg, succumbed to the infection.
A team lead by Timothy Welch at the US department of agriculture analysed genetic sequences from the drug-resistant plague microbe and compared them with similar sequences from food bacteria. They found a nearly identical 180-gene segment responsible for drug resistance in all of the organisms.
(Editor’s Note. And the above can therefore be bioengineered in a lab)