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Please Read Carefully.
heston and isleworth urban district council.
Public Health Department,
92, Bath Road, Hounslow.
What the Certificate Means.
Most children who have had this treatment are protected for a
number of years.
An occasional child, however, loses the protection quickly, due
to a peculiarity of the child's blood or body.
If you wish to get the best out of the treatment have your
child tested again in a year or two. If he or she is still safe, no
further injections are necessary. If the protection has been lost,
it can be restored.
Although your child, if protected, is extremely unlikely to contract
Diphtheria, do not assume that it is quite impossible.
A very few cases of Diphtheria have occurred among immunised
children. Such attacks are rarely serious but you should always
get your doctor to see a sore throat.
Elwin H. T. Nash,
Medical Officer of Health.
Anyone who has been engaged in immunological work for any
length of time realises that there is no such thing as an absolutely
perfect and certain process of immunisation which is applicable to
every person. Owing to individual bodily peculiarities a few subjects
respond poorly to injections, while a small number acquire
protection which they lose rapidly as a result of this bodily peculiarity.
It was with a view to reducing possible failures due to
the latter cause that the above handbill was drafted.
It must not be expected that no immunised child will ever
contract diphtheria. A few such cases must perforce be met with in
Heston and Isleworth area sooner or later. By energetic super
vision of the state of immunity of subjects a year or two hence, it