Smallpox 1

Smallpox

1. RELIANCE INSTITUTE OF NURSI NG

TOPIC








PRESENTED BY :-
MR. ROMAN BAJRANG
BASIC BS.C NURSING 2
ND YEAR
RELIANCE INSTITUTE OF NURSING

2. SMALLPOX


INTRODUCTION

 A highly contagious and frequently fatal viral disease.

 The disease is also known by the Latin names Variola or Variola Vera, which is a
derivative of the Latin Varius, meaning "spotted", or Varus, meaning "pimple".
 The term "Smallpox" was first used in Europe in the 15th century to distinguish Variola
from the "great pox" (Syphilis).
 Smallpox was responsible for an estimated 300–500 million deaths during the 20th
century.
 Believed to have begun in Africa and spread to India and china.

HISTORY

 First appeared in northeastern Africa around 10,000 BC

 Skin lesions on mummies 1570-1085 BC Ramses V

 In the elephant war in Mecca 568 AD, smallpox decimated the Ethiopian soldiers

 Introduction of smallpox into the new world (Carribean 1507, Mexico 1520, Peru 1524,
and brazil 1555 ) facilitated Spanish conquest
 Smallpox destroys Hottentots (1713)

 In 1738, smallpox killed half the Cherokee Indian population

 Smallpox disrupted colonial army in 1776

MICROBIOLOGY

 Caused by Variola virus

 Belongs to the genus Orthopoxvirus, the family Poxviridae and subfamily
Chordopoxvirinae
 Single, linear, double-stranded DNA molecules and replicate in cell cytoplasm.

 Shaped like bricks and measure about 300 x 200 nm in size

 Incubation: 12-14 days (range 7-17d)

3.  2 clinical forms:

 Variola major

 Variola minor

 Variola major

 Classic smallpox

 Predominant form in Asian epidemics

 Highest mortality (~30%)

 Variola minor

 Causes milder disease

 Discovered in 20
th
century
 Started in S. Africa

 Was most predominant form in N. America

TYPES

 Classic smallpox was considered the most communicable disease; about 30% of
unvaccinated people who came in contact with the virus were infected.
 The Hemorrhagic variety of Variola had a much higher death rate (95%) than classic
smallpox and lead to death more quickly.
 The Malignant or flat forms of smallpox affected 6% of the population and evolved
slower than the classic type of smallpox but with a death rate of almost 100%.
 The Modified variety of Variola essentially affected people who were vaccinated.

PATHOPHYSIOLOGY

Virus lands on respiratory/oral mucosa

Macrophages carry to regional nodes

Invades Reticuloendothelial organs

4. White blood cells infected


Systemic inflammatory response


SIGN & SYMPTOMS

 The initial symptoms that the person has are fever 103
0
, body aches, headache, chills and
vomiting.
 After the initial symptoms the virus creates a rash that starts as macules (flat, red lesions)
on the skin. Then vesicles (raised blisters) form and lastly pustules (pus filled blisters)
appear.
 Just after the rash appears, the virus is highly contagious as it moves into the mucous
membrane.
TRANSMISSION

 Airborne route

 Infectious materials:

 Saliva

 Vesicular fluid

 Scabs

 Urine

 Conjunctival fluid

 Possibly blood

 The virus can cross the placenta, but the incidence of congenital smallpox is relatively
low.
 Smallpox transmission does not occur through animals or insects.

5. PREVENTION

• The smallpox vaccine is the only known way to prevent smallpox in an exposed person.
The smallpox vaccine helps the body develop immunity to smallpox.
• Isolation of patients if they develop fever.


TREATMENT

 No proven treatment.

 Only thing done was to give those intravenous fluids and medicine to control fever and
pain.
 Antibiotics, given to prevent possible bacterial infections.


VACCINATION

 Edward Jenner demonstrated that immunity to smallpox could be produced by
inoculating a human with material from a lesion on the udder of a cow. Jenner called this
infectious material vaccine, and the procedure came to be called vaccination.
 The material Jenner used for his vaccine probably contained cowpox virus, a virus related
to Variola but not as virulent.
Smallpox (vaccinia ) vaccine dryvax®

 Lyophilized vaccinia containing calf lymph.

 Trace amounts of antibiotics:

 Polymyxin B.
 Streptomycin.
 Chlortetracycline.
 Neomycin.


THANKYOU!