Bifurcated needle

Bifurcated needle is a medical tool used primarily in the administration of smallpox vaccine. It was developed in the 1960s by Benjamin Rubin, an American researcher, and has been instrumental in the global eradication of smallpox.

Design and Function

The bifurcated needle is a small, stainless steel instrument, approximately 2.5 inches in length. The needle is bifurcated, or split, at the end, forming a "Y" shape. This design allows the needle to hold a droplet of vaccine in the fork via capillary action.

The bifurcated needle is used in a process called scarification, which involves making multiple punctures in the skin to deliver the vaccine. This method is particularly effective for the smallpox vaccine, which requires a live virus to be delivered directly into the skin.

History and Impact

The bifurcated needle was developed as part of the World Health Organization's (WHO) Intensified Smallpox Eradication Program. Prior to its introduction, other methods of vaccine delivery were less efficient and required larger quantities of vaccine.

The bifurcated needle, in contrast, required only a small amount of vaccine and was easy to use, making it ideal for mass vaccination campaigns. Its use was a key factor in the successful eradication of smallpox in 1980.

See Also

• Vaccination
• Smallpox
• World Health Organization

References

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Bifurcated needle

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  Smallpox vaccine injection
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  Bifurcated needle