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As a result of enquiry it was found that in 56 of the 79 cases
there was no known contact with a previous case; in 16 cases of
which 13 were in the patient's home and 3 outside the home a
history of contact with a previous case was ascertained, in 5 cases
no information as to previous contact was available and in 2 cases
the jaundice was a complication of another disease. In one case it
was stated that the patient had suffered from a previous attack
some months previously.
Of the 13 cases in which a history of contact with a previous
case in the home was given the inteival between contact and onset
was approximately a month in 7 cases; about 12 months in 3 cases;
about a week in 1 case and in 2 cases the interval was not known.
In the 59 instances in which there was no contact with a
previous case in the home the number of other persons in the house
in which the patient was nursed and who were therefore exposed
to infection varied from 1 to 8 as follows:- One person 6, two
persons 16, three persons 27, four persons 6, five persons 2, seven
persons 1, eight persons 1.
None of these contacts developed the disease and infection of
other members of the family by the patient appears to be relatively
infrequent,