PFGE of chromosomal DNA. Lane 1 contains 47 PFGE of chromosomal DNA. Lane 1 contains 47.5-kb λ marker; lane 2,H influenzae type a Pt 5; lane 3, H influenzae type a Pt 2; lane 4, H influenzaetype a Pt 1; lane 5, λ marker; lane 6 H influenzaetype a Pt 3 (CSF isolate); lane 7, H influenzae type a Pt 3 (... PFGE of chromosomal DNA. Lane 1 contains 47.5-kb λ marker; lane 2,H influenzae type a Pt 5; lane 3, H influenzae type a Pt 2; lane 4, H influenzaetype a Pt 1; lane 5, λ marker; lane 6 H influenzaetype a Pt 3 (CSF isolate); lane 7, H influenzae type a Pt 3 (blood isolate); lane 8, H influenzae type a Pt 4; lane 9, 47.5-kb λ marker. Elisabeth E. Adderson et al. Pediatrics 2001;108:e18 ©2001 by American Academy of Pediatrics