Microbiology All of the following are true regarding Legionella except. A Legionella can be grown on complex media B L. pneumophila serogroup 1 is the most common serogroup isolated from humans C Legionella are communicable from infected patients to others D L. pneumophila is not effectively killed by polymorphonuclear leukocyte 💡 Explanation All of the following are true regarding Legionella except. ✓ Correct Answer: C. Legionella are communicable from infected patients to others