Microarray differentiation of pathogens. Panels: 1, L. pneumophila serogroup O1; 2, L. pneumophila serogroup O2; 3, L. pneumophila serogroup O3; 4, L. pneumophila serogroup O4; 5, L. pneumophila serogroup O5; 6, L. pneumophila serogroup O6; 7, L. pneumophila serogroup O7; 8, L. pneumophila serogroup O8; 9, L. pneumophila serogroup O9; 10, L. pneumophila serogroup O10; 11, L. pneumophila serogroup O11; 12, L. pneumophila serogroup O12; 13, L. pneumophila serogroup O13; 14, L. pneumophila serogroup O14; 15, L. pneumophila serogroup O15; 16, non-pneumophila Legionella species; 17, L. pneumophila serogroups O1 and O6; 18, L. pneumophila serogroups O6 and O7; 19, L. pneumophila serogroups O1, O4, O10, and O13.