Typhoid vaccine

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Typhoid Vaccine

The Typhoid Vaccine (/taɪˈfɔɪd ˈvæksiːn/) is a vaccine that is used to prevent typhoid fever. The term "typhoid" comes from the Greek typhos, meaning smoky or hazy, describing the state of mind of those affected with typhoid fever. The term "vaccine" is derived from Vaccinia, the virus used in the smallpox vaccine, the first vaccine to be developed.

Types

There are two main types of typhoid vaccines: the oral Ty21a vaccine and the injectable Vi polysaccharide vaccine.

  • Ty21a vaccine is a live, attenuated vaccine taken orally. It is usually given in four doses, two days apart.
  • Vi polysaccharide vaccine is an injectable vaccine that is usually given as a single dose.

Usage

The typhoid vaccine is recommended for those who are at high risk of infection, such as those traveling to areas where typhoid is common, those who have close contact with a typhoid carrier, or those who work in a laboratory with the bacteria that causes typhoid.

Side Effects

Like all vaccines, the typhoid vaccine can cause side effects. Common side effects include fever, headache, and redness or swelling at the injection site for the injectable vaccine. For the oral vaccine, side effects may include nausea, vomiting, and rash.

Related Terms

  • Typhoid fever - An infectious disease caused by Salmonella typhi bacteria.
  • Vaccine - A biological preparation that provides active acquired immunity to a particular infectious disease.
  • Immunization - The process by which an individual's immune system becomes fortified against an agent.

External links

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