Immunization Related Terms
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Seizure
The sudden onset of a jerking and staring spell usually caused by fever. Also known as convulsions.
Seroconversion
Development of antibodies in the blood of an individual who previously did not have detectable antibodies.
Serology
Measurement of antibodies, and other immunological properties, in the blood serum.
Serosurvey
Study measuring a person's risk of developing a particular disease.
Shingles
See herpes zoster.
Side Effect
Undesirable reaction resulting from immunization.
Smallpox
An acute, highly infectious, often fatal disease caused by a poxvirus and characterized by high fever and aches with subsequent widespread eruption of pimples that blister, produce pus, and form pockmarks. Also called variola.
Strain
A specific version of an organism. Many diseases, including HIV/AIDS and hepatitis, have multiple strains.
Subclinical Infection
The presence of infection without symptoms. Also known as inapparent or asymptomatic infection.
Sudden Infant Death Syndrome (SIDS)
The sudden and unexpected death of a healthy infant under 1 year of age. A diagnosis of SIDS is made when an autopsy cannot determine another cause of death. The cause of SIDS is unknown. Also known as 'crib' or 'cot' death.
Susceptible
Unprotected against disease.
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