Spears. Bows and arrows. Swords. Guns. Bombs. Drones. Microbes. The evolution of weapons and forms of warfare shadows our technological advancements, from the field of metallurgy to that of microbiology.

A 1942 American propaganda poster derived from President Roosevelts Day of Infamy speech following the Pearl Harbor attacks. The poster, and other forms of PSAs that followed, are exemplary of the domestic sacrifices asked of Americans in the face of war even with the possibility of nuclear and biological warfare after WWII. Image: Library of Congress. Click for source.

Biological warfare has existed for thousands of years: cheap and easy, it is often referred to as the poor mans nuclear bomb. Few supplies are needed and the worst things come in small packages. Overt contamination is its crudest form dumping bodies or feces in sources of drinking water but deliberate exposure to infected bodies or contaminated objects has also been used to great effect.

The ancient Greeks, Romans and Persians reportedly dumped the bodies of animals into the wells of their enemies (1). In 1346, the Mongols used catapults to fling the bodies of plague victims over city walls during the siege of Caffa and the ensuing disease among city residents may have contributed to one of the waves of Black Plague that ravaged Europe in the 14th century as it traveled through Crimean ports (2). In 1763, the British army stationed at Fort Pitt gifted blankets to the Delaware Lenape Indians that had been used to cloak smallpox patients (3). Unsophisticated methods yet occasionally efficient.

The tremendous achievements we have made in the sciences and biotechnology over the course of the twentieth century have changed our approach to biological warfare, for better and worse. Antibiotics and vaccines are just two of the most prominent lifesaving products of our ongoing period of scientific exceptionalism and industrialization, but our advancements in microbiology and molecular technology have also paved the way for more sophisticated and nefarious methods of disrupting, threatening, and ending the lives of our enemies. Weve come a long way from dumping bodies in rivers and wells and have moved on to chopping genes into bacteria and viruses so as to achieve a maximally lethal impact.

Japan initiated the first large military-scale into the grim business of manipulating and manufacturing very small things that would kill many, many people. In the 1930s, the Japanese army embarked upon what would become a formidably efficient bioweapons program, the first of its kind to make use of extensive human experimentation and vivisection (4). Prior to WWII, they tested at least 25 pathogens on civilians and prisoners that killed as many as 600 people (5). During the war, they poisoned Chinese water wells, dropped plague-infested fleas by planes and spread pestilence throughout the country that endured long after the war was over (6).

As a proactive, preventative measure against the Japaneses microbiological advances, the US ventured into defensive biological weapons research in 1940 which eventually transformed into offensive weapons research as the war broke out in the Korean peninsula (7)(8).

In 1952, the US Civil Defense released a PSA to the American public, What You Should Know About Biological Warfare, educating the populace on the steps to take in the event of a biological attack from our cold war enemies. Clips of shadowy men wearing fedoras spraying aerosolized substances into air shafts and pouring unknown yet suspicious-looking liquids into rivers are interspersed with information on washing contaminated food and clothes, on the necessities of mass inoculation and on the voluntary provision of blood samples.

The PSA provides viewers with a series of tips to keep panic to a minimum in the aftermath of a biological event:

Cooperate with the authorities dont give way to fear dont listen to scare-talk, rumors or myths be careful what you eat and drink always report sickness promptly.

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Alchemists Gone Bad: What You Should Know About Biological Warfare