Dear hamnawa ......
That isn't some kind of ( standard ) letter that could be used particularly for Any kind of reference ??!! It's just a simple ( doctor's original letter head) in wich he ( in his own words ) states that this child XXXXX has been recieved complete vacsinations up to his age X , and that those vacsinations meet the Ontario standards of vacsinations ( or choose the province you plan to land at )
See its a simple deceleration type of a thing that your doctor has to say ( on his clinical letter head ) accompanying your child's up dated immunization card

. These two things would be enough for the child's enrollment into a Canadian school

. Hope this helps !!?
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Ya it did, thanks An architect