“Immunization” or “Immunisation”—What's the difference?

Usage by country

Where each spelling is used

Of the 12 countries below, 8 prefer “immunization” and 4 prefer “immunisation”. Usage levels are out of 100; the more common spelling in each country is in bold.

Usage level out of 100 (if available).
Country	immunization	immunisation	Preference
United States	99	1	“immunization”
United Kingdom	14	86	“immunisation”
India	81	19	“immunization”
Philippines	98	2	“immunization”
Canada	96	4	“immunization”
Australia	8	92	“immunisation”
Liberia	100	0	“immunization”
Ireland	17	83	“immunisation”
New Zealand	11	89	“immunisation”
Jamaica	100	0	“immunization”
Trinidad & Tobago	90	10	“immunization”
Guyana	100	0	“immunization”

Usage

Examples in context

Real sentences for each spelling. Hover an example to copy it.

“immunization”

…scares and groups/individuals opposed to immunization.
Primary immunization against meningococcal disease with meningitis…
Natural hygienists oppose drugs, fluoridation, immunization, most medical treatments and endorse…
…mortality in half and raise immunization rates from 20 to 95%.
…universal health care, hospitals, pharmaceutical, immunization programs, disease prevention, supervision and…
Contraindication to Pertussis immunization should be observed in patients…
…State Department of Health’s extensive immunization mandates.
…included: disseminating informational materials about immunization, organizing immunization campaigns, organizing training…
…a role in the nation's immunization program, they, along with the…
…at first, if no artificial immunization is available.

“immunisation”

…the southern states and resumed immunisation in the north, where Muslim…
…CD8+ responses to infection or immunisation.
…the presidency, she organised polio immunisation campaigns and Mobil Pintar (Smart…
…adverse drug reactions, allergies and immunisation history in an easily accessible
…and 2003 in an MMR immunisation campaign.
…Pakistan to use technology for immunisation coverage.
…general surgery and an expanded immunisation program.
…of Health completed a mass immunisation campaign of children in Plovdiv…
…under the Expanded Programme of Immunisation (EPI).
…a new building containing an immunisation clinic, club rooms for the…

Examples are Wikipedia snippets under the CC ShareAlike 3.0 license.

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