Read e-book online Epidemiology in Country Practice PDF

By William Norman Pickles (Auth.)

ISBN-10: 1483167658

ISBN-13: 9781483167657

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Extra resources for Epidemiology in Country Practice

Sample text

As I have said, when I have been able to trace infection in a patient to a single exposure of short duration, the incubation period appears to be twelve days, but I find in families that this is frequently shortened to ten or eleven, which suggests that the infection is present one or two days previous to the advent of symptoms. In the present epidemic Roland and Edith first had symptoms on March 11, their mother on March 21, the baby brother and a little sister on March 22. There has been little variation in the incubation period as I have observed it, and I believe that it is in the neighbourhood of what I have always seen when I could trace the infection to a single exposure, and that has been twelve days.

T h e epidemic spread to the sister village, and the whole of the sufferers appear on the chart, including one case of herpes zoster. This sufferer was an elderly woman who lived at a very remote farm and seldom left her home. Her initial symptoms commenced on July 15, and the probable source of her infection was a child of three, who visited the farm on July 4, but whose rash did not appear until the 7th. It is difficult, I find, to fix the correct day of commencement in herpes zoster, as the pain begins with a slight soreness and increases for several days before the appearance of the rash.

CHICKEN-POX AND SHINGLES ( I ) 1937 1 8 5 22 29 APRIL MAY JUNE JULY AUG. KEY. I i 1 VARICELLA • HERPES & • THIS CHL ID HAD BOTH DS IEASES SM I ULTANEOUSLY. The charts of the epidemics of 1937 are reproduced in full, as, curiously enough, they began in each instance with a sufferer from herpes, and each contained another sufferer from this disease (Charts IV, V). On April 27 a young married woman began with the initial symptoms of herpes frontalis. She had some pain, but the CHICKEN-POX AND SHINGLES 51 illness was not severe and she was not confined to bed.

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Epidemiology in Country Practice by William Norman Pickles (Auth.)


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