All this talk about vaccinations has brought back some memories. Anyone who went through US military basic training, or boot camp as the Navy called it, can recall getting vaccinated over & over until you had every vaccine & booster there was. They avoided using needles & syringes, as that was way too slow. Instead, they used jetguns that shot small volumes of liquid at high pressure through your skin.
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They'd wipe the tip of the jetgun and your shoulder with alcohol, grab your elbow, and pull the trigger. If you didn't move, the vaccine was shot under your skin, and you were fine. It was fast. A whole company of 80 recruits could be done in about 15 minutes.
When possible, they combined vaccines into one shot. If you were lucky, they only did one arm, not both at the same time.
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Here's a close up of a jetgun.
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Does anyone remember these? Are they still used now? Wouldn't they be useful once the coronavirus vaccine is available?