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ZIKA VIRUS UPDATE 2016
LARRY M. BUSH, MD, FACP
Affiliated Professor of Clinical Biomedical Sciences
Charles E. Schmidt College of Medicine
Florida Atlantic University
Affiliate Associate Professor of Medicine
University of Miami – Miller School of Medicine / Palm Beach County
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NEWLY IDENTIFIED INFECTIOUS
DISEASES AND PATHOGENS (2)
Year Disease or Pathogen
2012 MERS-CoV
2009 H1N1
2004 Avian influenza (human cases)
2003 SARS
1999 Nipah virus
1997 H5N1 (avian influenza A virus)
1996 New variant Creutzfelt-Jacob disease;
Australian bat lyssavirus
1995 Human herpesvirus 8 (Kaposi’s sarcoma virus)
1994 Savia virus; Hendra virus
Source: Workshop presentation by David Heymann, World Health Organization, 1999
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Emerging and Re-emerging
Infectious Diseases
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• Emerging infectious diseases: Infectious diseases that have newly appeared in a population.
• Global :
• Regional:
• Re-emerging Diseases: Diseases’ incidence in human has increased during the last 20 years or threatens to increase in the near future.
• Global:
• Regional:
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AS Fauci
GLOBAL EXAMPLES OF EMERGING AND
RE-EMERGING INFECTIOUS DISEASES
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Factors responsible for emerging of
infections.
I-Ecological changes and Agricultural
development.
Placing the people in contact with a
natural reserviour or host of a hitherto
unfamiliar, but usually already present,
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Example 1 :
Reforestation in USA
Increased the number of deer & deer ticks
Deer ticks are
natural reserviour
of Lyme diseases
Increased
Human
contact with
deers
Human affection by Lyme disease
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II- Changes in Human
demographics and behaviours
Inflation of population size
Insufficient infrastructures
Use open containers for water
Breading mosquitos
Dengue fever in Asia
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•Urbanization-more people concentrated in
cities-often without adequate infrastructure
•Increases in the elderly populations
•Increases in children in daycare: working
woman with kids under 5 was 30% in 1970,
is 75% in 2000.
•Fast paced Lifestyles- increase in
convenience items and more stress
•High-risk behavior- Drug use and
unprotected sex
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War and FamineWar refugees are a full 1% of the global population
War refuges are forced onto new areas where they
are exposed to new microbes from vectors and
people.
War and famine are closely linked.
In 2001, tracking 16 countries with “food
emergencies”, showed that 9 were because of civil
unrest.
Famine is also caused by social, economic, and
political forces.
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• III-International travel and Commerce.
• 365 days to circumnavigate the globe…now
it takes 36 hours
• -used to quarantine ships, but 36 h faster
than disease incubation
• 400 million people per year travel
internationally
• increased incidence of both Tuberculosis
and Influenza transmission on long flights
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The global air network
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Commercial Air Traffic Over a 24 Hour Period
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Average annual number of global airline
passengers by decade, 1950-2010
IATA 2010
Mill
ion
of
Pa
sse
ng
er
(Mil)
Decade
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• -Transportation of products is an increased concern.
• -rapid transport of disease harboring fresh products.
• -transport of livestock facilitates movements of viruses and arthropods (especially ticks)
Travel and HIV/AIDS.
-Silk route and plague.
-Slaves trade and yellow fever.
-Migration to new world and smallpox.
Cholera and Hajj.
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IV- Technology and industry
• Modern mass production increased the
chance of accidental contamination and
amplifies the effect of such contamination.
-Contamination of hamburger meat by
E.coli strains causing haemolytic uraemic
syndrome.
-Feeding cattle by byproducts of sheep
causing bovine spongiform encephalitis.
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VI- Breakdown of public health measures.
• -Decrease in choline in water supplies
lead to rapid spread of cholera in South
America.
• Non functioning water plant in Wisconsin,
USA lead to outbreak of waterborne
cryptosporidium.
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Major Factors Contributing to the
Emergence of Infectious Diseases
1. Human demographics and behavior
2. Technology and industry
3. Economic development and land use
4. International travel and commerce
5. Microbial adaptation and change
6. Breakdown of public health measures
Institute of Medicine Report 1992
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THE EMERGENCE OF ZIKA VIRUS
1947 – Isolation from Rhesus monkey, Zika forest, Uganda
1948 – Isolated from Aedes africanus mosquitos, Zika
forest, 6% people in area test positive serologically
1952 – Nigeria, isolated from child, fever & headache
1956 – Human volunteer inoculation, limited febrile illness
1962 – Uganda, person with rash, fever, body pain
1960’s – 1970’s _ Africa and Asia febrile illness, sero +,
Nigeria sero-prevalence 48% to 56%
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RECENT ZIKA VIRUS EPIDEMICS
2007 – Yap Island, Micronesia (pop. 10,000),
rash, fever, arthralgia, conjunctivitis, 73%
inhabitants IgM antibodies, 19% clinical illness
2013 – French Polynesia islands (pop. 270,000),
28,000 cases, Guillain-Barre Syndrome (20% up)
2015 – NE Brazil, Americas & Caribbean, 33
countries
Feb 2016 – WHO microcephaly & neuro
disorders (GBS), 4th international emergency
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Rates of Microcephaly by State in Brazil 2010-2014 vs 2015-2016
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Zika epidemic and GBS
Countries reporting increased incidence of Guillain-Barre Syndrome and Zika prevalence:
• Brazil
• El Salvador
• Columbia
• Suriname
• Venezuela
• Media reports in Puerto Rico and Honduras have not been confirmed
• Martinique has reported no increase of GBS, but is reporting cases of GBS among lab-
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GUILLAIN-BARRE SYNDROME and ZIKA VIRUS: Attributable Risk?
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32
• Daytime mosquito – dawn and dusk; however due to LED light use is thought to be active at night
• Limited movement – flying radius of 500m
• Female lays ~80 eggs every 3 days
• Needs blood meal to lay eggs
• Eggs can survive several years out of water
• 4 stages of the lifecycle, 3 are water related
• Well adapted to human habitats (water storage, waste, white lights, air conditioning, bromeliads)
Aedes Aegypti
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ZIKA VIRUS EPIDEMIOLOGY
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Kraemer MUG, et alii, eLife 2015;4:e08347
Possible Geographic Distribution of Aedes aegypti
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ALL COUNTRIES & TERRITORIES with ACTIVE ZIKA VIRUS
TRANSMISSION
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LABORATORY CONFIRMED ZIKA VIRUS CASES REPORTED TO ARBONET
BY STATE OR TERRITORY AS OF SEPTEMBER 7, 2016
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HOW MANY ZIKA CASES SO FAR…HOW ABOUT THE ASYMPTOMATIC CASES
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Sept 7, 2016
LABORATORY CONFIRMED ZIKA CASES UNITED STATES / TERRITORIES
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Pregnant Women with Any Laboratory Evidence of Possible Zika Virus Infection
US States and the
District of Columbia
671
*Includes aggregated data
reported to the US Zika
Pregnancy Registry as of Sept
1, 2016
US Territories**
1080
**Includes aggregated data
from the US territories reported
to the US Zika Pregnancy
Registry and data from Puerto
Rico reported to the Zika
Active Pregnancy
Surveillance System as of Sept
1, 2016
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Liveborn infants with birth defects*
17
Includes aggregated data reported to the US
Zika Pregnancy Registry as of Sept 1, 2016
Pregnancy losses with birth defects**
5
Includes aggregated data reported to the US
Zika Pregnancy Registry as of Sept 1, 2016
Liveborn infants with birth defects*
Pregnancy Outcomes in the United States and the District of Columbia
Pregnancy Outcomes in the United States Territories
Pregnancy losses with birth defects**
1
Includes aggregated data from the US territories
reported to theUS Zika Pregnancy Registry and data
from Puerto Rico reported to the Zika Active
Pregnancy Surveillance System as of Sept 1, 2016
1
Includes aggregated data from the US territories
reported to theUS Zika Pregnancy Registry and data
from Puerto Rico reported to the Zika Active
Pregnancy Surveillance System as of Sept 1, 2016
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Zika outbreak prompts
travel warning for area
of Miami
3:32 a.m. Tuesday, Aug.
2, 2016 | Filed in: News
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ARE YOU SURPRISED ?
It’s here: Florida 1st state with local
Zika cases, transmitted by mosquito
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Palm Beach Post
CDC tells pregnant
women to avoid Miami-
Dade after latest
outbreak
6:11 p.m. Friday, Aug. 19, 2016 | Filed in: News
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Active Zika Virus Transmission in Florida
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FDA says to check all
blood donations for Zika
5:59 p.m. Friday, Aug. 26, 2016 | Filed in: News
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Zika virus clinical disease course and outcomes
– Clinical illness is usually mild.
– Symptoms last several days to a week.
– Severe disease requiring hospitalization is uncommon.
– Fatalities are rare.
– Guillain-Barré syndrome (GBS) reported in patients following suspected Zika virus infection.
• Relationship to Zika virus infection is not known.
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Symptoms
Many infections asymptomatic.
Most common symptoms
– Acute onset of fever
– Maculopapular rash
– Joint pain
– Conjunctivitis
Other symptoms include muscle pain and headache.
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Reported clinical symptoms among confirmed Zika virus disease cases
Duffy M. N Engl J Med 2009
Yap Island, 2007
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Rash, swollen joints, and conjunctival hyperemia
Source: Research team of the São Luís/MA municipal health office - From a presentation by the Ministry of Health of Brazil, 2015
Clinical Presentation of rash syndrome in
Northeast Brazil, May 2015
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Clinical features: Zika virus compared to dengue and chikungunya
Rabe, Ingrid MBChB, MMed “Zika Virus- What Clinicians Need to Know?” (presentation, Clinician Outreach and Communication Activity (COCA) Call, Atlanta, GA, January 26 2016)
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DIAGNOSES AND TESTING FOR ZIKA
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60
Risk of Dengue virus transmission = risk of Zika virus transmission
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REPORTING ZIKA CASES
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Reporting cases
Zika virus disease is a nationally notifiable condition. Report all confirmed cases to your state health department.
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ZIKA AND PREGNANCY
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CLINICAL MANAGEMENT OF INFANTS WITH CONFIRMED
OR POSSIBLE ZIKA INFECTION
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SEXUAL TRANSMISSION
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PRECONCEPTION GUIDANCE
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WHAT TO TELL PATIENTS ABOUT ZIKA
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Patients who test positive
Protect from mosquito bites during the first week of illness, when Zika virus can be found in blood.
The virus can be passed from an infected person to a mosquito through bites.
An infected mosquito can spread the virus to other people.
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WHAT TO TELL PATIENTS ABOUT MOSQUITO BITE PROTECTION
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“There are risks and costs
to action. But they are far
less than the long range
risks of comfortable
inaction”.
John F. Kennedy
…But what are we asking
congress to invest billions of
dollars in??