A major mode of transmission of foodborne illnesses is: via mosquito transmission via fecal-oral route via person to person contact via hypodermic syringes Question 42 In the United States, is a protozoan flagellate most common among those who travel to endemic areas, in homosexuals, and in child day care settings where constant diaper changing facilitates the spread from one child to another. Amebiasis Giardia Cryptosporidiosis Hepatitis Cholera .