Page 12 22. The figure represents the structure of a Zika virus. Genome Capsid 40 nm 1,000,000 nm = 1 mm Which row in the table describes the structure of a Zika virus? Capsid Genome Diameter (m) A Protein Nucleic acid 40 × 10−6 B Protein Nucleic acid 40 × 10−9 C Nucleic acid Protein 40 × 10−6 D Nucleic acid Protein 40 × 10−9 23. Schistosomiasis in humans is caused by an A ectoparasitic arthropod B endoparasitic amoeba C endoparasitic nematode D endoparasitic platyhelminth. 24. Cholera is a disease which causes diarrhoea and is potentially fatal. It is transmitted through the consumption of food or water contaminated by the bacterium Vibrio cholerae. It often has a higher incidence in refugee camps than in the surrounding countryside. Which of the following measures is not appropriate for reducing the incidence of cholera in refugee camps? A Improved vector control B Increased sanitation C Decreased population density D Reduced costs for cholera vaccines