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Current Trends Influenza Update -- United States

Influenza activity caused by type B and type A(H1N1) viruses continued in early April, especially in northern states. According to state reports and isolates from collaborating laboratories, virus activity was at generally low levels.

Alaska, Illinois, Massachusetts, and New Mexico, which had reported influenza type B isolates earlier, recently reported their first influenza type A(H1N1) isolates of the season, and Delaware, Kansas, Louisiana, Maine, and New Jersey have now reported influenza type B isolates. Two additional reports of outbreaks associated with influenza type B virus in nursing homes have been received. In New Jersey, 2 type B isolates were obtained in a nursing home where 28 of 122 residents had influenza-like illness in the period March 21-April 3. In California, 18 of 46 elderly residents had febrile respiratory illness between mid-February and mid-March, and 3 died. Type B influenza virus was isolated from 1 patient, and high titers to influenza B were detected in convalescent-phase serum specimens from 7 of 9 patients. Reported by P Gross, MD, B Mojica, MD, W Parkin, DVM. State Epidemiologist, New Jersey State Dept of Health; S Fannin, MD, Los Angeles County, J Chin, MD, State Epidemiologist, California Dept of Health; BJ Francis, MD, State Epidemiologist, Illinois State Dept of Public Health; R Gilfillen, PhD, J Dicinti, NJ Fiumura, MD, State Epidemiologist, Massachusetts Dept of Public Health; L McLaren, PhD, University of New Mexico, Albuquerque, H Hull, MD, J Mann, MD, State Epidemiologist, New Mexico State Health and Environmental Dept; J Jean, PhD, DR Cowan, DDS, MS, State Epidemiologist, Delaware Dept of Health and Social Svcs; R Gohd, PhD, Charity Hospital, New Orleans, C Caraway, DVM, State Epidemiologist, Louisiana State Dept of Health and Human Resources; H Lind, PhD, W Nersesian, MD, Acting State Epidemiologist, Maine State Dept of Human Svcs; D Ritter, MD, J Middaugh, MD, State Epidemiologist, Alaska State Dept of Health and Social Svcs; R Carlson, PhD, DE Wilcox, MD, State Epidemiologist, Kansas State Dept of Health and Environment; Epidemiology Div, US Air Force School of Aerospace Medicine; Influenza Br, Center for Infectious Diseases, CDC.

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