This report is based on data contributed by: J Lofgren, MD, B Whitley, MD, Alabama Dept of Public Health; B Eichold, MD, P Wilson, MPH, B Bodie, MD, A Morris, MD, W Hannon, MSN, W McCullum, S McRae, MA, S Baker, MA, A Lamar, MA, K Micher, MS, G Clausell, R Pelt, Mobile County Health Dept; B Estrada, MD, J Quinonez MD, Univ of South Alabama, Mobile. J Middaugh, MD, Alaska Dept of Health and Social Svcs. C McRill, MD, K Komatsu, MPH, W Humble, MPH, Arizona Dept of Health Svcs; L Sands, DO, MPH, Maricopa County Dept of Public Health, Phoenix, Arizona. J Hadler, MD, M Cartter, MD, P Mshar, T Wegrzyn, MPH, Connecticut Dept of Health. S Wiersma, MD, Florida Dept of Health; P Blake, MD, S Lance-Parker, PhD, J Fletcher, MD, C Morin, MD, Georgia Dept of Human Resources, Div of Public Health. M Dworkin, MD, C Jennings, MPH, Illinois Dept of Public Health. R Teclaw, DVM, H Messersmith, M Wilkinson, Indiana State Dept of Health. P Quinlisk, MD, J Goddard, Iowa Dept of Public Health. G Pezzino, MD, G Hansen, MD, Kansas Dept of Health and Environment. S Englender, MD, T Johnson, Kentucky Cabinet for Health Svcs, Dept for Public Health. K Gensheimer, MD, G Beckett, MPH, J Gunderman-King, Maine Dept of Human Svcs, Bur of Health. D Blyth, MD, K Fujii, MHS, J Casani, MD, Maryland Dept of Health and Mental Hygiene. A DeMaria, Jr, MD, M Horine, MPH, D Heisey, MPH, E Traphagen, MPH, E Gould, MPH, Massachusetts Dept of Public Health. H Hull, MD, M Feaver, MPH, Minnesota Dept of Health. M Currier, MD, S Slavinski, DVM, Mississippi Dept of Health. C Reddick, P Robinson, G Storm, B Owen, H Marx, F Khan, MD, J Gilliam, Missouri Dept of Health and Senior Svcs. J Greenblatt, MD, J Montero, MD, R Dipentima, New Hampshire State Dept of Health and Human Svcs. E Bresnitz, MD, J Brook, MD, New Jersey Dept of Health and Senior Svcs. P Thomas, MD, H Mackley, MPH, B Asante, MD, G Krigsman, MD, New York City Dept of Health; M Lepow, MD, J Mysliborski, MD, J Hill, MD, P Hughes, MD, Albany Medical College; S Brandt-Ruzza, P McAllister, N Jones, Albany County Health Dept; J Menrath, Bethlehem Central School District, Albany County; T Giombetti, MD, Delmar; S Hayes, N Chatterjee, PhD, E Rizzo, MPH, New York State Dept of Health. F Smith, MD, M Burkett, MD, Ohio Dept of Health. M Kohn, MD, K Southwick, MD, K Hedberg, MD, E DeBess, DVM, L Davidoff, MD, M Scott, M Heumann, MA, Oregon Health Div. Y Chilcoat, G Stevens, V Barbour, MSN, J Baures, J Manwaring, B Thomas, G Chakarun, Jackson County Public Health Dept, Medford; R Parlier, M Jaqua, M Breedlove, MPA, N Nunley, Yamhill County Health Dept, McMinnville, Oregon. J Rankin, Jr, DVM, J Hersh, MEd, K Nalluswami, MD, M Moll, MD, K Waller, MD, C Coventon, MD, C Teacher, MSN, Pennsylvania Dept of Health. F Sassano, Bucks County Dept of Health, Doylestown; J Maher, MD, E Walls, Chester County Health Dept, Westchester; C Bayesinger, M Supplee, MS, Montgomery County Human Svcs Center, Norristown; J Jahre, MD, St. Luke's Hospital Network, Bethlehem; N Sykes, MD, Jefferson Medical College, Philadelphia; S Naides, MD, Hershey Medical Center, Hershey, Pennsylvania. D Perrotta, PhD, J Perdue, Texas Dept of Health. R Stroube, MD, E Barrett, DMD, S Jenkins, VMD, Virginia Health Dept; J Florance, MD, A Ansher, MD, L Estrada, MPH, B Bradshaw, Prince William Health Dept, Manassas, Virginia. L Haddy, MA, D Bixler, MD, West Virginia Dept of Health and Human Resources, Bur for Public Health; P Gordon, MD, R Moodispaugh, R Swiger, Harrison-Clarksburg Health Dept, Clarksburg, West Virginia. Local health and education departments and schools. A Tepper, PhD, B Lushniak, MD, G Burr, Div of Surveillance, Hazard Evaluation, and Field Studies, National Institute for Occupational Safety and Health; L Anderson, MD, N Khetsuriani, MD, Div of Viral and Rickettsial Diseases, National Center for Infectious Diseases. L Kolbe, PhD, S Everett, ScD, Div of Adolescent and School Health, National Center for Chronic Disease Prevention and Health Promotion; A Adija, MD, K Griffith, MD, J McLaughlin, MD, J Mullins, DVM, M Traeger, MD, EIS officers, CDC.