Question 1 which pathogen that causes disease is the simplest and smallest? a: virus b: fungus c: protozoa d: bacteria question 2 how is the cold pathogen usually spread? a: contact with an infected persons clothes b: contaminated water or food c: direct contact with other people d: from infected mosquitos question 3 which type of pathogen causes the flu? a: protozoa b: fungi c: bacteria d: virus question 4 how can the spread of pathogens to others be easily prevented? a: stay away from biting insects and ticks b: stay away from sick people c: keep hands away from ones face d: wash hands frequently question 5 which practice can the body to fight an infection when sick? a: get regular health screenings b: stay awake as long as much as possible c: avoid strenuous activity d: get a vaccine