Malaria & Dengue Global Health Lecture Series
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1 Malaria & Dengue Global Health Lecture Series Julie Gutman, MD MSc Pediatric Infectious Disease 5/13/2011
2 What would be the most appropriate treatment for a patient presenting with malaria acquired in Haiti? n 1. Malarone n 2. Quinine + Clindamycin n 3. Chloroquine n 4. Doxycycline n 5. Mefloquine
3 What would be the most appropriate treatment for a patient presenting with malaria acquired in Nigeria with >5% parasitemia? n 1. Malarone n 2. Quinine + Clindamycin n 3. Chloroquine n 4. Doxycycline n 5. Mefloquine
4 What would be the most appropriate treatment for a patient presenting with malaria acquired in Nigeria with 2% parasitemia? n 1. Malarone n 2. Quinine + Clindamycin n 3. Chloroquine n 4. Doxycycline
5 Characteristic symptoms of dengue include all of the following except? 1. Fever 2. Frontal headache 3. Retro-orbital pain 4. Diarrhea 5. Maculopapular rash
6 A patient who contracts dengue for the first time is at high risk of DHF? n 1. True n 2. False
7 In a patient presenting with fever who returned from Haiti 3 weeks ago, which of the following illnesses should be considered? n 1. Dengue n 2. Malaria
8 Treatment with Primaquine is required for which of the following species? n 1. P. falciparum n 2. P. vivax n 3. P. malariae n 4. P. ovale n 5. P. vivax and P. ovale
9 Case n 7-year-old, previously healthy female, 5-day history of fever to 104 F and headache n Abdominal pain, with emesis x 5 n Denies diarrhea. Denies cough and runny nose. n The parents are from Sierra Leone, the child was born in US. n Family returned 3 days ago from a 6 week visit to Senegal. This was the child s 1 st trip abroad. n The child s symptoms started 2 days prior to return. n Her mom also complaining of fevers and emesis, the rest of family is healthy
10 Physical examination n Temp 38 C, HR 136, RR 22, BP 89/54, 28.1 kg n General: Awake and alert, no apparent distress. n HEENT: Scleral icterus. n Lungs: clear. n CVS: RRR. No murmurs, rubs, or gallops. n Abdomen: Soft, Liver~6 cm below costal margin. n Extremities: No edema n Skin: No rash or petechiae, no jaundice. n Neuro: Intact
11 Laboratory CRP ESR 46 N43, B40, L14 AST 107 ALT 112 Total bilirubin 5.5
12 Laboratory CRP ESR 46 N43, B40, L14 AST 107 ALT 112 Total bilirubin 5.5
13 Diagnosis?
14 MALARIA
15 Which is the most appropriate treatment for this patient who was found to have 27% parasitemia? 1. Doxycycline 2. Quinine + Doxycycline 3. Malarone 4. Quinine + Clindamycin 5. Mefloquine
16 Which is the most appropriate treatment for this patient who was found to have 27% parasitemia? 1. Doxycycline 2. Quinine + Doxycycline 3. Malarone 4. Quinine + Clindamycin 5. Mefloquine
17 Hospital Course n Started on IV quinidine + IV clindamycin n Developed hypotension; resolved with NS bolus n Tachypnea and mild hypoxia requiring 1lt O2 n CXR with pulmonary edema n Resolved w/in 24 hours n After about 24 hours of treatment, parasitemia < 1% n Switched to oral therapy n 3 days quinine and 7 days clindamycin
18 Malaria n Parasitic disease caused by one of 5 species of Plasmodium n P. falciparum n P. vivax n P. ovale n P. malariae n P. knowlesi n Transmitted by bite of female Anopheles mosquito
19 Plasmodium falciparum n Infects all stages of RBCs n Potentially fatal n Widespread drug-resistance n Chloroquine n Fansidar (SP) n Mefloquine
20 Plasmodium vivax n Potential for relapsing malaria n Hypnozoites remain dormant in the liver
21 Vectors of human malaria n > 100 species of Anopheles mosquitoes n Each species occupies a distinct ecological niche n Different species have different biting and resting behavior n Affects transmission potential n Only females bite for blood meals
22 Malaria Life Cycle Mosquito Oocyst Zygote Sporozoites Mosquito Salivary Gland Gametocytes Exoerythrocytic (hepatic) cycle Hypnozoites Human Erythrocytic Cycle
23 Current Malaria Situation n One of the most important and devastating infectious diseases in the developing world. n ~40% of the world s population is at risk n ~2.4 billion people n ~27 million U.S. residents travel each year to malarious areas n Costs Africa > US$12 million annually n Slows economic growth in Africa by 1.3% a year
24 Malaria Endemic Countries Hay, et al A World Malaria Map: Plasmodium falciparum Endemicity in PLoS Med6(3): e
25 Global Burden of Malaria
26 Morbidity and Mortality n million clinical cases annually n ~ 1 million deaths annually n 90% of deaths occur in Africa n Mostly among children under 5 years n One African child dies every 30 seconds
27 Chloroquine would be appropriate prophylaxis for which of the following places? 1. Brazil 2. Nigeria 3. Brazil and Thailand 4. Mexico and Haiti 5. Mexico, Haiti, and Brazil
28 Chloroquine would be appropriate prophylaxis for which of the following places? 1. Brazil 2. Nigeria 3. Brazil and Thailand 4. Mexico and Haiti 5. Mexico, Haiti, and Brazil
29 CQ resistant Pv Antimalarial Drug Resistance chloroquine-sensitive chloroquine-resistant multiple drug-resistant
30 Chloroquine susceptibility n Caribbean, including Haiti n Central America west of the Panama Canal n Parts of the Middle East n Iraq n Chloroquine resistance is found in Iran, Saudi Arabia, Afghanistan, Pakistan
31 Clinical Presentation Uncomplicated Malaria n Symptoms n Fever, 100% n Headache, 100% n Weakness, 94% n Signs n Anemia n Thrombocytopenia n Night sweats, 91% n Arthralgias, 59% n Myalgias, 56% n Diarrhea, 13% n Abdominal cramps, 8%
32 Clinical Presentation Severe or Complicated Malaria n Cerebral malaria n Hyperparasitemia: parasitemia >5% n Severe anemia: Hb <5 mg/dl n Shock n Renal failure n Pulmonary edema or ARDS n DIC, thrombocytopenia n Metabolic acidosis n Hypoglycemia
33 Malaria infection and acquired immunity n No complete protective immunity n Repeated infection can result in resistance to severe illness n At a great cost in infant and child survival n Does not protect from primary infection/ illness n Greater risk of asymptomatic infection and gametocytemia n Pregnancy disrupts acquired immunity
34 How can you make a diagnosis of malaria? n 1. Blood Smear n 2. Rapid Diagnostic Tests n 3. PCR n 4. Serology n 5. All of the above
35 How can you make a diagnosis of malaria? n 1. Blood Smear n 2. Rapid Diagnostic Tests n 3. PCR n 4. Serology n 5. All of the above
36 Diagnosis- Blood Smear n The gold standard n Diagnosis based on morphologic characteristics n Requires trained personnel and microscope n Thick Smear n RBCs are lysed to show the presence of parasites n Threshold of detection 5-20 parasites/ul n Thin Smear n Parasites seen within RBCs. n Better for speciation. n Threshold of detection 100 parasites/ul
37 Diagnosis- Rapid Diagnostic Tests n Detect presence of malaria antigen n Either Pan-malaria or Pf specific n Rapid and require little technical skill and no electricity n Take ~ 15 minutes to get a result n Less sensitive than blood smear n Threshold of detection ~ 200 parasites/ul n May remain positive for up to 3 weeks after treatment n BinaxNow- only RDT licensed in the US n P. falciparum Sensitivity 99.7%, Specificity 94.2% n P. vivax Sensitivity 93.5%, Specificity 99.8%
38 Diagnosis- PCR n Most sensitive test n Able to detect very low level parasitemia n Provides accurate speciation n Requires sophisticated machinery, electricity, skilled technician
39 Diagnosis- Serology n Detects antibodies to malaria n Remains positive after treatment for several years n Not widely used nor highly useful
40 Malaria Treatment: Non-falciparum n Chloroquine PLUS Primaquine n Primaquine n Eradicates liver phase (hypnozoite) in P. vivax and P. ovale infections n G6PD testing n CQ-resistant P. vivax - Oceania and S America n Mefloquine or quinine for proven resistant cases
41 Malaria Treatment: P. falciparum n Acquired in CQ-sensitive areas n Chloroquine alone n Acquired in CQ-resistant areas n Coartem (Artemether- Lumefantrine) n Malarone (Atovaquone- Proguanil) n Quinine + Clindamycin, doxycycline, or tetracycline n Mefloquine
42 Malaria Treatment: Severe Malaria n Criteria n parasite density > 5% n unable to take oral medication n evidence of complications n IV quinidine + clindamycin, doxycycline, OR tetracycline n IV artesunate (available from CDC) n Exchange transfusion n parasite density > 10% n altered mental status n renal or pulmonary complications
43 Chemoprophylaxis CDC Recommendations n Areas with NO chloroquine resistance n weekly chloroquine n Areas with chloroquine resistance n mefloquine weekly n doxycycline daily n Atovaquone/ proguanil daily n Long-term exposure n post exposure prophylaxis with primaquine
44 CDC Malaria Risk Map n
45 DENGUE
46 DENGUE VIRUS n Transmitted by Aedes aegypti mosquito n domestic, day-biting n preferentially feeds on humans n ssrna positive-strand Flavivirus n 4 Serotypes (DENV 1, 2, 3, or 4) n 60-80% homology n Infection results in immunity ONLY to the infecting serotype
47 Importance/ Global Burden n Most important mosquito-borne viral disease affecting humans n 40% of world s population in at risk areas n 2.5 billion people n million infections yearly n 500,000 DHF cases n 22,000 deaths, mostly among children n : estimated cost of US$ 440 million
48 Distribution
49 Infection in Travelers n Infection rate in febrile travelers = % n Leading cause of systemic febrile illness among travelers returning from the Caribbean, South America, South Central Asia, and Southeast Asia n Among 17,353 ill travelers in GeoSentinel network
50 Clinical Presentation: Break Bone Fever" n Incubation: 3-14 days n Asymptomatic infections n Self-limiting febrile illness lasting ~ 1 week n Acute onset of high fever n Frontal Headache, Retro-orbital pain n Myalgias, Arthralgias- may progress to arthritis n Nausea, vomiting n Maculopapular rash n Change in taste sensation n weakness, malaise, & anorexia may persist several weeks.
51 Dengue Hemorrhagic Fever (DHF) n Develops following first phase of illness n As fever subsides, patient becomes lethargic, with circulatory failure, and hemorrhage n Thrombocytopenia n Hemoconcentration n Capillary leak may result in dengue shock syndrome (DSS) n May be fatal
52 n Case-fatality rate ~ 5% Dengue n Can be reduced to <1% with proper treatment. n Hydration n Avoid Aspirin and NSAIDS n Dengue shock syndrome: fatality >10% n Risk factors for DHF n Prior dengue infection history of the patient n Strain of the infecting virus n Age of patient n Most fatal cases are among children and young adults.
53 Diagnosis n ELISA n Non-specific among the flaviviruses n West Nile, St. Louis encephalitis, Yellow Fever, Japanese encephalitis, Tick borne encephalitis, etc. n RT-PCR n Viral antigen identification in autopsy tissue samples by immunofluorescence or immunohistochemical analysis
54 Prevention n Insect Avoidance n DEET containing repellant n Long sleeves and pants n Light colored clothing n Permethrin treatment of clothing n Accommodations with air conditioning, window screens
55
56 What would be the most appropriate treatment for a patient presenting with malaria acquired in Haiti? n 1. Malarone n 2. Quinine + Clindamycin n 3. Chloroquine n 4. Doxycycline n 5. Mefloquine
57 What would be the most appropriate treatment for a patient presenting with malaria acquired in Haiti? n 1. Malarone n 2. Quinine + Clindamycin n 3. Chloroquine n 4. Doxycycline n 5. Mefloquine
58 What would be the most appropriate treatment for a patient presenting with malaria acquired in Nigeria with >5% parasitemia? n 1. Malarone n 2. Quinine + Clindamycin n 3. Chloroquine n 4. Doxycycline n 5. Mefloquine
59 What would be the most appropriate treatment for a patient presenting with malaria acquired in Nigeria with 8% parasitemia? n 1. Malarone n 2. Quinine + Clindamycin n 3. Chloroquine n 4. Doxycycline n 5. Mefloquine
60 What would be the most appropriate treatment for a patient presenting with malaria acquired in Nigeria with 2% parasitemia? n 1. Malarone n 2. Quinine + Clindamycin n 3. Chloroquine n 4. Doxycycline
61 What would be the most appropriate treatment for a patient presenting with malaria acquired in Nigeria with 2% parasitemia? n 1. Malarone n 2. Quinine + Clindamycin n 3. Chloroquine n 4. Doxycycline
62 Characteristic symptoms of dengue include all of the following except? 1. Fever 2. Frontal headache 3. Retro-orbital pain 4. Diarrhea 5. Maculopapular rash
63 Characteristic symptoms of dengue include all of the following except? 1. Fever 2. Frontal headache 3. Retro-orbital pain 4. Diarrhea 5. Maculopapular rash
64 A patient who contracts dengue for the first time is at high risk of DHF? n 1. True n 2. False
65 A patient who contracts dengue for the first time is at high risk of DHF? n 1. True n 2. False
66 In a patient presenting with fever who returned from Haiti 3 weeks ago, which of the following illnesses should be considered? n 1. Dengue n 2. Malaria
67 In a patient presenting with fever who returned from Haiti 3 weeks ago, which of the following illnesses should be considered? n 1. Dengue n 2. Malaria
68 Treatment with Primaquine is required for which of the following species? n 1. P. falciparum n 2. P. vivax n 3. P. malariae n 4. P. ovale n 5. P. vivax and P. ovale
69 Treatment with Primaquine is required for which of the following species? n 1. P. falciparum n 2. P. vivax n 3. P. malariae n 4. P. ovale n 5. P. vivax and P. ovale
70 Emergency Triage n The Lecture was: Clear and Understandable a) Strongly Agree b) Agree c) Unsure d) Disagree e) Strongly Disagree
71 Emergency Triage n The Lecture was: At appropriate level for audience a) Strongly Agree b) Agree c) Unsure d) Disagree e) Strongly Disagree
72 Emergency Triage n The Lecture was: Informative and Covered Sufficient Detail a) Strongly Agree b) Agree c) Unsure d) Disagree e) Strongly Disagree
73 Emergency Triage n The Lecture was: Interactive and Facilitated Discussion a) Strongly Agree b) Agree c) Unsure d) Disagree e) Strongly Disagree
74 Emergency Triage n The Lecture was: Well Organized a) Strongly Agree b) Agree c) Unsure d) Disagree e) Strongly Disagree
75 Emergency Triage n The Lecture was: Overall Good a) Strongly Agree b) Agree c) Unsure d) Disagree e) Strongly Disagree
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