Transcript Communicable disease: dengue fever

COMMUNICABLE
DISEASE:
DENGUE FEVER
Community Health Nursing NUR 4404
Michelle Boswell
Spring 2011
PURPOSE
This presentation will discuss various aspects of Dengue fever:
o Signs and symptoms
o Vectors
o Areas of prevalence
o At risk population
o Stages of infection
o Spectrum of disease occurrence
o Control of the disease
o Treatment
EPIDEMIOLOGY
 Dengue fever is can be caused by
one of four different serotypes
 Having one type of Dengue does
not protect you from having
another type in the future
 More than one infection can
cause a greater risk of developing
dengue hemorrhagic fever and
dengue shock syndrome (Dengue
fever, 2010)
VECTOR
 Nies and McEwen tell us that vectors “can be animals or arthropods,
and they can transmit through biological and mechanical routes” (p. 500,
2007).
 Dengue fever is transmitted between people by mosquitos
 In rare cases, dengue fever can be transmitted from organ transplants or
from mother to fetus
(Dengue fever, 2010)
INCUBATION PERIOD
 Symptoms usually begin 4-7 days after being bitten
 Symptoms then last 3-10 days
 “For transmission to occur the mosquito must feed on a person during a 5-
day period when large amounts of virus are in the blood; this period usually
begins a little before the person become symptomatic”
 Some people never have significant symptoms but can still infect
mosquitoes.
 After entering the mosquito, the virus will need 8-12 days incubation before
it can then be transmitted to another human. The mosquito is infected for
the rest of its life.
(Dengue fever, 2010)
EMERGING DISEASE
 Dengue occurs in some parts of
the tropics and subtropics as an
endemic, which means every
year during rainy season
 The four types of Dengue
emerged from monkeys
 The virus independently jumped
to humans in Africa and
Southeast Asia between 100
and 800 years ago
(Dengue fever, 2010)
INCIDENCE
 Prior to 1981, there were no known cases of Dengue in south or
central America
 The first documented cases were not until the 1950’s in the Philippines
and Thailand (Dengue fever, 2010)
 The World Health Organization (WHO) estimates that 50 to 100
million infections occur yearly, including 500,000 DHF (Dengue
hemorrhagic fever) cases and 22,000 deaths, mostly among children.
AREAS OF PREVALENCE
DENGUE IN THE U.S.
 Nearly all cases in the United States have been from travelers or
immigrants
 The last continental outbreak was in south Texas in 2005
 There was a small outbreak in Hawaii in 2001
 26 states have a law that mandates reporting of Dengue fever cases
 Starting in 2009, all cases in the United States must be reported to the
CDC
(Dengue fever, 2010)
SIGNS AND SYMPTOMS
 Undifferentiated fever (usually 2-7 days)
 Severe headache, retro-orbital eye pain, myalgias, arthralgias, a
diffuse erythematous maculo-papular rash, and mild hemorrhagic
manifestation. Subtle, minor epithelial hemorrhage, in the form of
petechiae, are often found on the lower extremities (but may
occur on buccal mucosa, hard and soft palates and or
subconjunctivae as well), easy bruising on the skin, or the patient
may have a positive tourniquet test.
 Leukopenia is frequently found and may be accompanied by
varying degrees of thrombocytopenia. Children may also present
with nausea and vomiting. Serological testing for anti-dengue IgM
antibodies or molecular testing for dengue viral RNA or viral
isolation can confirm the diagnosis, but these tests often provide
only retrospective confirmation.
(Dengue fever, 2010)
SIGNS AND SYMPTOMS
VIRUS FLOW CHART
DENGUE HEMORRHAGIC FEVER
 Dengue fever can become DHF quickly, which is life threatening.
DENGUE SHOCK SYNDROME
 Dengue fever can quickly become DHF or DSS (Dengue shock syndrome) if
not treated quickly
 Signs and symptoms of the disease process are noted below:
 Abdominal pain or tenderness
 Persistent vomiting
 Clinical fluid accumulation (i.e., pleural effusion or ascites)
 Mucosal bleeding
 Lethargy or restlessness
 Liver enlargement (≥2cm)
 Increases in hematocrit concurrent with rapid decrease in platelet count
CLINICAL MANIFESTATIONS
TREATMENT
Dengue fever
 Fluid replacement to maintain
perfusion and urine output,
decrease tachycardia, and
improve blood pressure
 Methods to keep fever down,
except aspirin
DHF or DSS
 Timely and judicious use of
supportive care
 Administration of isotonic
intravenous fluids or colloids
 Close monitoring of vital signs
and hemodynamic status, fluid
balance, and hematologic
parameters
PREVENTION
 There is no vaccine for dengue fever
 Travelers must be aware of risks in the areas they are visiting.
 There is a Travel Notices page within the CDC website that allows
travelers to see current outbreaks in different countries
http://wwwnc.cdc.gov/travel/notices.aspx
 Stay away from mosquito-infested areas
 Wear bug repellant, cover extremities, and sleep under a mosquito net if
necessary
LOCAL ACTIONS
 Local government health departments
put out fliers reminding citizens to
protect themselves against mosquitos,
including not leaving containers of water
around, because these are breeding
grounds for mosquitos
 Using mosquito nets and bug repellent
are other ways to prevent the virus, but
many citizens may not have access to
these items
 Some countries’ efforts are listed on the
following slides
PUERTO RICO
 Dengue is a major health burden in Puerto Rico. Televised public service
announcements and posters, elementary and pre-school educational programs, and
an exhibit at the Children's Museum in Old San Juan were evaluated separately using
knowledge and practices surveys administered to children and their parents, surveys
of house lots for larval container habitats, focus groups, and interviews with program
organizers and participants. Exposure to the programs was associated with increased
dengue-related knowledge, increased proportion of tires protected from rain,
decreased proportion of water storage containers positive for mosquito larvae, and
increased indoor use of aerosol insecticides. Exposure to the elementary school
program was associated with slightly lower indices of residential mosquito
infestation. The programs have resulted in high levels of awareness, some behavior
change, and limited change in larval indices. Greater emphasis on the skills necessary
for community members to keep containers free of mosquito larvae would increase
program effectiveness.
(Winch, 2002)
DOMINICAN REPUBLIC
 The Ministries of Public Health and Social Assistance announced a RD$17 million
campaign for dengue prevention and control throughout the country.
Deputy Minister of Public Health, Dr. Nelson Rodriguez Monegro said that over the next
three months the health authorities will be involved in the process together with the
municipalities, civil society bodies and community representatives.
He explained that the measures include overall management of dengue prevention and
control, which will involve the entire Dominican population in order to reduce the
incidence of the disease in the country.
He said that the components of the program include increased surveillance for the
detection of fever, overall control by eliminating mosquitoes that spread dengue and
eliminating breeding sites, and launching a massive educational campaign.
Monegro also cited efforts for improvement in the care of people who contract the
disease and the involvement of local groups in actions to prevent and control dengue.
(Dengue fever prevention, 2010)
SRI LANKA
 The Ministry of Health is to commence its special dengue prevention program from
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Colombo
The Ministry plans to carry out the dengue prevention program in two phases. In the
first phase the Ministry plans to introduce an awareness program followed by a
sanitization program in the second phase.
The Health Ministry hopes to carry out its awareness program from house to house
with the assistance of the Colombo Municipal Council (CMC) and several nurses
unions.
In the second phase of this process the Ministry will destroy all the places that
promote the mosquito breeding in the Colombo municipality.
The Health Ministry expects the public support for this program as the spreading of
the dengue fever in the country has become a national crisis.
Similar dengue prevention programs for outstations will be carried out in the coming
weeks.
(Dengue prevention programs, 2009)
PHILIPPINES
 The government has embarked on a nationwide information campaign in the wake of
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the rising incidence of dengue cases in the country.
In a news briefing, President Benigno S. Aquino III said the drive is focused on
cleanliness particularly in the light of a Department of Health report of a 50 percent
increase in the incidence of the killer disease this year.
“During our meeting on Monday, Dr. Enrique Ona (DOH Secretary) mentioned
there was a 50 percent increase in the incidence of dengue cases. He is now going
around for an education campaign dealing with the cleanliness drive,” the President
said.
The President said the educational drive involves public awareness and participation
in cleaning the common breeding grounds of the Aedes aegypti mosquitoes such as
unattended old tires, empty cans and bottles, gutters and the like.
From January to July this year alone, the DOH reported 40,648 cases with a total of
328 deaths
(Government launches, 2010)
METHODS OF RESEARCH
Dengue fever (2010). In Centers for disease control. Retrieved April 20, 2011,
from http://www.cdc.gov/Dengue/
Dengue fever prevention program (n.d.). In real-estate-dominican.com.
Retrieved April 21, 2011, from http://www.real-estatedominican.com/medical-info/153-dengue-fever-preventionprogram- 2010.html
Dengue prevention programs to commence from Sri Lanka capital (2009,
May 16). In Colombopage: Sri Lanka Internet Newspaper. Retrieved
April 21, 2011, from
http://www.colombopage.com/archive_091/May1242481165RA.ht
ml
METHODS OF RESEARCH
Government launches nationwide dengue info drive (2010, August 25). In
Philippines, Embassy of the Philippines. Retrieved April 21, 2011, from
http://www.philippineembassy-usa.org/news/526/300/Gov-tlaunches-nationwide-dengue-info-drive/d,phildet/
Nies, M. A., & McEwen, M. (2007). Community/Public health nursing (4th ed., p.
500). St. Louis, MO: Saunders Elsevier.
Winch, P., Leontsini, E., Rigau-Perez, J., Ruiz-Perez, M., Clark, G., & Gubler, D.
(2002, October). Community-based dengue prevention programs
in Puerto Rico: impact on knowledge, behavior, and residential
mosquito infestation [Electronic version]. American Journal of
Tropical Medicine and Hygiene, 67(4), 363-370.