When the human immune system is exposed to a disease once, it can develop the ability to quickly respond to a subsequent infection. Therefore, by exposing an individual to an immunogen in a controlled way, their body will then be able to protect itself from infection later on in life.
More on [ Immunization ]

Immunize Canada - A public resource discussing the benefits of vaccines and vaccinations. Information on diseases, vaccines, immunization schedules, travel and health.
Luggage Life - Provides quick reference information about vaccinations that should be considered before travelling.
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Massachusetts Department of Public Health - Division of Epidemiology and Immunization, Bureau of Communicable Disease Control's extensive list of recommendations and information for immunizations.
Meta Description: [ The Division of Epidemiology and Immunization is responsible for
the investigation of outbreaks of communicable diseases, surveillance
of reportable diseases, and provision of educational materials and
services to assist communities in reducing the ... ]
MCW HealthLink: Travel Medicine - Details of major infectious diseases and information about in which countries they are found, plus recommended vaccines and precautionary advice.
Meta Description: [ MCW HealthLink articles on Travel Medicine ]
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National Immunisation Service of Malta - A site aimed at providing information about services offered in Malta by the National Immunisation Service department within the Government Health Division.
TravelVacs.ca - Designed to assist Canadian travelers in determining what precautions and vaccinations if any, may be considered when traveling overseas. It will also provide the location of your nearest travel clinic. In French and English. From Aventis Pasteur Limited.
Meta Description: [ This site is designed to assist canadian travellers in determining what precautions and vaccinations if any, may be considered when travelling overseas. It will also provide the location of your nearest travel clinic., Travelvac informe les voyageurs Canadiens sur les maladies, les pays à risque... ]
Tropical Medical Bureau - Vaccination information for the international traveller, from an Ireland tropical medicine clinic.
Meta Description: [ Tropical Medical Bureau - Vaccinations and Health Information for the International Traveller - International Travel Advice ]
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