WorksheetsYellow fever & Dengue
Total questions: 10
Worksheet time: 5mins
A 28-year-old man returns from a 2-week trip to the jungles of Brazil and presents with fever, jaundice, and bleeding gums. Which of the following statements is true regarding Yellow fever?
Transmitted by Aedes aegypti mosquito bites
Caused by a Flavivirus with a positive-sense single-stranded RNA
Characterized by midzonal hepatic necrosis leading to liver failure
Confirmation requires nucleic acid testing of serum in acute phase
A 45-year-old woman living in Angola experiences sudden onset high-grade fever with headaches and myalgias. She recalls being bitten by mosquitoes. Which test would be most specific to confirm her diagnosis in the initial phase?
Yellow fever IgM antibodies
Yellow fever neutralization test
Yellow fever antigen detection
Yellow fever PCR
Which one of the following prevention measures is likely to provide life-long protection against developing yellow fever disease after viral exposure?
Elimination of mosquito breeding sites
Giving measles vaccination
Administration of Yellow fever vaccine
Providing contact tracing and prophylaxis
During an outbreak in Africa, how is a presumptive diagnosis of yellow fever made clinically?
Demonstration of IgM against yellow fever virus
Four-fold rise in antibody titer in paired sera
PCR detection of yellow viral RNA
Symptoms of fever with jaundice after visiting forest
Which public health strategies led to elimination of urban yellow fever transmission from the Americas?
Vaccination and patient isolation
Screening immigrants and contacts tracing
Mosquito vector control program implementation
Quarantining affected areas with travel restrictions
A 7-year-old girl in Bangkok develops high fever with bodyache. Examination reveals petechiae and ultrasound shows mild ascites. Blood smear is positive for thrombocytopenia. Which mosquito transmits the infection?
Aedes albopictus
Culex tritaeniorhynchus
Anopheles stephensi
Aedes aegypti
A 11-year-old Malaysian boy has severe muscle pains and bleeding gums after 4 days of high-grade fever. Which one of the following laboratory findings confirms diagnosis?
Rise in complement fixation titers
Rapid card test detecting NS1 antigen
Dengue IgM antibody in single serum sample
Dengue IgG seroconversion in paired sera
A 30-year-old woman in Philippines presents with fever, rash and retro-orbital pain. She recalls being bitten by mosquitoes near her home last week. Identification of antibody against which DENV protein confirms diagnosis?
Capsid
Envelope
NS3 protease
NS5 polymerase
A university student comes with dengue fever symptoms 2 days after his housemate. Likely source of his infection is
Vector transmission from housemate
Inhaling respiratory droplets
Which public health intervention has been most effective in controlling spread of dengue epidemics?
Patient isolation and barrier nursing
Insecticide indoor residual spray campaigns
Mass vaccination with live attenuated vaccine
Elimination of mosquito breeding sites in household water sources
