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106
(1) In the erection of housing estates of any size, development
should be by small sections, spaced out. The first of these small
sections should preferably adjoin settled stable communities.
Communication with this district will then prevent that loss of
herd immunity. When each of these small sections has become
absorbed in the neighbouring area and become stabilised, it can be
linked up and extended by the addition of other small sections which,
in turn, become stabilised by the original new portion of the estate.
It would be necessary for each new section to be small, to enable
it all to be in touch with a stable district. A large section might
result in the creation of an island of susccptibles.
(2) Maintenance of the previous level of the immunity index
in this scction can be preserved by :—
(a) Bringing into the district a population cf normal age
distribution, with its further quota of immunes; that
is, by bringing the older adults, as well as the younger
members of the family.
(b) Immunising a large population of the suseeptibles
before transfer.