Symptoms may start 1 to 2 weeks after a person gets infected, but it can take as long as 3 weeks for symptoms to appear. People are infectious (meaning they can spread the virus to someone else) from the time symptoms start until all lesions have crusted and scabs have fallen off to ...
Smallpox is a disease caused by infection with a virus called “variola.” It usually spread in densely populated places because thevariola viruscan spread to other people through the small droplets discharged from the upper airway when an infected person cough or sneeze, as well as through th...
person is able to transmit infection only from the time of onset of rash until scabs form. Although a patient normally experiences a 10- to 12-day asymptomaticincubation periodafter the patient is infected, the patient cannot transmit virus during this period. Thus, although an infected patient ...
Definition (MSH)A mild, eruptive skin disease of milk cows caused by COWPOX VIRUS, with lesions occurring principally on the udder and teats. Human infection may occur while milking an infected animal. ConceptsDisease or Syndrome(T047)
It can also be spread by touching things that an infected person has touched, although catching the virus that way isn't as common. The incubation period for smallpox is generally 12 to 14 days, which means a person may not show signs of infection for around two weeks, according to the...
Infected by smallpox at age x Dying by smallpox at age x The total number of victims of the smallpox up to age x The number of people dying for other causes at the age xFootnote 7 Fig. 1 Bernoulli’s table (Bernoulli, 1766, p. 44) Full size image Bernoulli then prepares an...
Smallpox usually spreads to people who have close personal contact with an infected person. Rarely, smallpox spreads through the air in an closed environment, such as a building, where someone has smallpox. A large outbreak in a school or workplace would be uncommon. The virus survives no ...