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32
(b) Mass Radiography.
A report was made to the March Committee of the excellent
response which had been received to the invitation to pupils over
14 years of age and to all members of the Committee's administrative,
teaching and manual staff to attend for X-ray examination
during the visit of the Unit to Walthamstow.

The total of 3,743 compares with 3,680 examined in the 1950
Survey.
Of the 50 children recalled for large films, 27 were normal, 9
had healed primary tuberculosis, 3 had healed post primary tuberculosis
and one had tubercular pleural effusion. Of the others, 3
had pneumonitis, 2 had congenital heart lesions and there were
single cases of bronchiectasis, bony abnormality, acquired heart
lesion, and azygos lobe.
Of the 8 school staff recalled, there were 2 with healed primary
tuberculosis, one with healed post primary tuberculosis, one with
bronchiectasis and one with an acquired heart lesion.
(c) Tuberculosis Vaccine Clinical Trials (Medical Research
Council).
The follow-up of the vaccinated and control groups which was
begun in June, 1952, continued throughout 1953. As will be seen
from the following report contributed by Dr. T. M. Pollock, Physician-in-Charge
of the trials, 77 per cent. attended for the second
annual re-examination as compared with 81 per cent. for the first
re-examinations in 1952. In view of all the difficulties involved, this
is regarded as a reasonably satisfactory response.
Dr. Pollock reports as follows:—
"The Tuberculosis Vaccines Clinical Trial in which Walthamstow
Health authorities are co-operating with the Medical Research
Council, continued to make good progress during 1953. Eight hundred
and sixty-three volunteers in the borough who joined the
scheme at school are taking part. The Trial began in Walthamstow
in 1950 and is also taking place in 24 other North London boroughs,