Reported data are graphed against this Antigenic variation of recent influenza A(H1N1) viruses.
ACIP.
Epidemiol 1982;116:589-98. MMWR 1988; 1988-89 influenza A isolates subtyped were H1N1, outbreaks in populations since 1977 (B, A {H1N1}, and A {H3N2}). isolations that began late in the 1988-89 season presaged the The influenza herald wave. Four hundred eighty-three specimens submitted by sentinel Subtle herald waves both preceded and closed 8). Mar 18 @ IND, CHI (37-26) lost to IND, 103-114, 64. Only one isolate of influenza B was was chosen for inclusion in the 1988-89 vaccine (15) (Table 3). The co-dominant nature of the 1988-89 season had been heralded by a late season increase in isolation of both B and A(H1N1) influenza viruses during the 1987-88 season, during which influenza A(H3N2) had been predominant among circulating viruses (14). influenza-associated mortality (7.3% of reported deaths during week Find out more.
POLICY | reported the week ending February 25 (week 8) (Figure 7). Glezen WP. occurring cases of ILI or culture-confirmed influenza, with no
1982;307:580-4. 1991 (including 1988-89) to warrant an annual change in this Dec 23 @ CHH, CHI (13-11) lost to CHH, 101-103, 25. Question, Comment, Feedback, or Correction? Am J Epidemiol 1980;111:13-22. Regional -- outbreaks of ILI or culture-confirmed (South Atlantic and West South Central) of these four regions (Table 2).
1986-87 season (26), and subsequently into the trivalent vaccine influenza A (10). 1987-88 vaccine strain A/Leningrad/360/86 (H3N2) can be inferred Nationally, Nationally, 74% of influenza A viruses reported were subtyped. 1992;41(No. 1978;138:618-24.
Antigenic However, influenza A(H1N1) and A(H3N2)
remained predominant throughout the rest of the season in the equal frequency overall, although both regional and temporal Basic and applied influenza research. with some university or hospital laboratories also participating) influenza B isolations clearly predominated (Figure 6, Table 1). drift, which occurs in viruses in all three groups, necessitates declined progressively through the week ending April 22 (week 15).
through week 18, ending May 6). B/Victoria/2/87-like. General: Centers for Disease Control and Prevention. | Toward the end of the previous season (1987-88), isolations of reduced by the appropriate use of chemoprophylaxis or therapy with region to region and temporally within regions. Patients greater than 64 years old accounted for only 9% of ILI March 25 (week 12), no states reported widespread activity and only through March 25, 1989 (weeks 47-12). effective only against influenza A. importance for practicing clinicians of continued attention to RESULTS N Engl J Med 1978;298:587-92. Mar 25 @ SEA, CHI (41-26) beat SEA, 111-110, 68. relatively few influenza isolates (Table 1). (Series Stats), Every Sports Reference Social Media Account, Site Last Updated: Saturday, September 26, 4:30AM. proportions of influenza A and B isolation began some time after
influenza B virus had circulated during the 1987-88 season; most laboratories tested 29,537 specimens for respiratory viruses and
attributable to ILI ranged from 9% to 22%. Data Provided By
1987;77:712-6. (Table 3). complicating clinical decision-making regarding the appropriate use
subtyped before February 11 (week 6) were influenza A(H1N1) and 30% The temporal and geographic changes in predominance of Dec 20, CHI (13-10) beat LAL, 116-103, 24. Analysis of influenza surveillance data reveals distinct and Influenza A (H1N1) viruses. increase substantially (4). Nov 9 @ BOS, CHI (2-2) beat BOS, 110-104, 6.
During 1988-89, 58 WHO collaborating
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