Table 6.
The dominant circulating virus type for each northern hemisphere season ending in the years 1973–1993 is shown with references. An additional virus is listed if it contributed to more than 15% of the positive isolates for that season (data from [39].
| Year | Dominant Virus Type | References |
|---|---|---|
| 1973 | H3N2 | [38,40,41] |
| 1974 | H3N2 | [38,40,41] |
| 1975 | H3N2 | [38,40,41] |
| 1976 | H3N2 | [38,39,41] |
| 1977 | B (+25% H3N2) | [38,39,41] |
| 1978 | H3N2 (+16% H1N1) | [39,41] |
| 1979 | H1N1 | [39,41] |
| 1980 | B virus | [39,41] |
| 1981 | H3N2 (+22% H1N1) | [41] |
| 1982 | B virus (+24% H1N1) | [41]; MMWR 1982; 31(27): 375–379 |
| 1983 | H3N2 | [41]; MMWR 1983; 32(29): 373–377 |
| 1984 | H1N1 (+45% B virus) | [41]; MMWR 1984; 33(29): 417–421 |
| 1985 | H3N2 | [41]; MMWR 1985; 34(28): 440–444 |
| 1986 | B Virus (+24% H2N3) | [41]; MMWR 1986; 35(29): 475–479 |
| 1987 | H1N1 | [41]; MMWR 1988; 37(31): 466, 468–470, 475 |
| 1988 | H3N2 | [41]; MMWR 1988; 37(32): 497–503 |
| 1989 | B Virus (+44% H1N1) | [41]; MMWR 1989; 38(11): 183–185 |
| 1990 | H3N2 | [41]; MMWR 1990; 39(17): 293–296 |
| 1991 | B Virus | [41]; MMWR 1991; 40(14): 231–233, 239–240 |
| 1992 | H3N2 (+18% H1N1) | [41]; MMWR 1992; 41(18); 315–317, 323 |
| 1993 | B Virus | [41]; MMWR 1992; 41(18): 315–317, 323 |