Smallpox

admitted appear attack body carried cause cent century chickenpox clinical common condition considerable countries cowpox deaths described diagnosis died disease early effect England epidemic eruption evidence experience face fact figures four frequently further give given hand hospital immunity important increase incubation period individuals infant infection initial inoculation interest Jenner known later lesions less London lymph malignant March material medical officer method mild minor months mortality natural normal nursing observations obtained occur outbreak particularly patient persons population possible practice present probably produced rash recorded regarded relatively reported result revaccination rise risk scabs scars secondary seems seen severe similar skin smallpox smallpox hospital spread staff stage successful suggests technique thought unvaccinated usually vaccination vaccinia variola major virus ward