What the difference between a single dose and a multi-dose vaccine?
A single dose vaccine is one that is stored in a single vial that is disposed of after the one dose is given to a person. With a multi-dose vaccine, multiple vaccine doses are stored in a single vial and the doses from the same vial are given to different people. Is thimerosal in all vaccines? No. Most vaccines licensed in Canada do not contain thimerosal. Since 1994, all routine childhood vaccines, with the exception of the flu vaccine, administered in Canada have not contained thimerosal. Thimerosal is not added to single dose vaccines. In Canada, vaccines to prevent the following diseases are used for routine immunization of children and do not contain thimerosal: • Diptheria • Tetanus (lockjaw) • Pertussis (whooping cough) • Polio • Rubella (German measles) • Measles (red measles) • Mumps • Hepatitis B (available free to children only in some provinces and territories) • Haemophilus influenzae type b disease • Meningococcal C • Pneumococcal • Varicella For immunization of infants a
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