Concerns
There have been relatively few incidents of disease transmission between users, despite widespread use of the jet injector by the military and in large-scale vaccination campaigns. Nevertheless, because the jet injector breaks the barrier of the skin, there is a potential that biological material is transferred from one user to the next. Some infectious viruses such as hepatitis B can be transmitted by less than one millionth of a millilitre so makers of injectors need to ensure there is no cross-contamination between applications. The World Health Organization no longer recommends jet injectors for vaccination due to risks of disease transmission.
An experiment using mice, published in 1985, showed that jet injectors would frequently transmit the viral infection LDV from one mouse to another. Another study used the device on a calf, then tested the fluid remaining in the injector for blood. Every injector they tested had detectable blood in a quantity sufficient to pass on a virus such as hepatitis B.
From 1984-1985 a weight-loss clinic in Brazil injected a pregnancy hormone into their clients, mostly using a jet injector. It was noted that a number of these patients became sick with hepatitis. When studied, 57 out of 239 people who had received the jet injection tested positive for hepatitis B.
As well as transmission between patients, jet injectors have inoculated bacteria from the environment into users. In 1988 a podiatry clinic used a jet injector to deliver local anaesthetic into patients' toes. Eight of these patients developed infections caused by Mycobacterium chelonae. The injector was stored in a container of water and disinfectant between use, but the organism grew in the container. This species of bacteria is sometimes found in tap water, and had been previously associated with infections from jet injectors.
Read more about this topic: Jet Injector
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—Henry David Thoreau (1817–1862)
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