. Preventive medicine and hygiene. upon theprobability of the take, as well as the protection. It is not wise to de-pend upon one. There is a definite relation between the number ofvesicles and the degree and length of the immunity (see page 17). TheGerman regulations of 1899 require at least four incisions, each one cen- SMALLPOX AND VACCINATION 11 timeter long and two centimeters apart. The Local Government Boardof England directs that four vesicles should be produced, and that thetotal area of the vesicle formation shall not be less than one-half a squareinch. My own practice follows that o
. Preventive medicine and hygiene. upon theprobability of the take, as well as the protection. It is not wise to de-pend upon one. There is a definite relation between the number ofvesicles and the degree and length of the immunity (see page 17). TheGerman regulations of 1899 require at least four incisions, each one cen- SMALLPOX AND VACCINATION 11 timeter long and two centimeters apart. The Local Government Boardof England directs that four vesicles should be produced, and that thetotal area of the vesicle formation shall not be less than one-half a squareinch. My own practice follows that of Dock, who makes not less thantwo incisions about an inch long and an inch apart; but in case of ex-posure to smallpox three or four such incisions are advisable. The Operation.—The skin at the site of the operation must be sur-gically clean, but need not necessarily be treated with antiseptics. Ifsuch are used, they must be carefully washed away in order not todestroy the activity of the virus. A thorough preliminary scrubbing. 0> tfif ?preventivemedici1917rose
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