不信任伤害巴西黄热病疫苗运动

outbreak – n. a sudden rise in the number of cases of a disease

dose – n. the amount of a medicine, drug, or vitamin that is taken at one time

mosquito – n. a small flying insect that bites the skin of people and animals and sucks their blood

transmit – v. to infect someone else with a virus or disease

defect – n. a physical problem; something that causes weakness; a lack of something needed for something to operate perfectly

mutation – n. a change in the genes of a plant or animal that causes physical characteristics that are different from what is normal