The
florid vaccination site contains high titers of vaccinia
virus. Transfer of this virus from the primary site
to other parts of the body, or to other individuals
is a constant threat. Accidental implantation varies
from single lesions to massive involvement of disruptive
skin disorders (e.g. eczema).
The degree of skin involvement appears to parallel the
risk and severity of accidental implantation. Slight
lesions, such as superficial wounds, burns and those
seen in skin diseases may pose less of a risk than massively
involved skin areas. Nevertheless, any disrupted skin
can lead to implantation, although the consequences
may be less for minor lesions.
Adequate screening of vaccinees and contact information
may assist in preventing such transmission. Covering
the lesion and instruction to the vaccinees as to the
potential for transmission may also assist in lowering
the risk.
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