Question

legionella pneumophila is a gram - negative bacterium that can cause legionnaires disease in immunocompromised individuals. much of its success is attributed to its ability to form a biofilm in the lungs of its host. in this instance, what is the best explanation for the advantage conferred by biofilm formation? l. pneumophila recruits other bacterial species, thus causing secondary infections that suppress the immune response. the biofilm causes an increase in nutrient exchange between host cells and the pathogen. biofilm formation prevents host immune cells from attacking the bacteria present. the formation of a biofilm prevents individual bacterial cells from drying out. the biofilm matrix hampers penetration of antibiotics used to kill l. pneumophila.

Explanation:

Biofilm formation by Legionella pneumophila recruits other bacterial species and can cause secondary infections that suppress the immune response. This is an advantage as it helps the bacteria survive and spread in the host environment. Biofilm matrix can also hamper penetration of antibiotics. However, the key advantage is the recruitment - related immune - suppression.

Answer:

L. pneumophila recruits other bacterial species, thus causing secondary infections that suppress the immune response.