| Clue | Source | Date |
|---|---|---|
| Outbreak of the late 1950s | Wall Street Journal | 24 Sep 2022 |
| Malady caused by H2N2 | New York Times | 17 Jan 2016 |
| Malady caused by H2N2 | ||
| Israeli reportedly went on a plane with serious complaint | Irish Times Crosaire | 12 Oct 2015 |
| Eastern strain of the H2N2 virus | ||
| Outbreak caused by the H2N2 virus | ||
| Unwanted import from the East? | ||
| Cause of global panic in 1957 | ||
| Unwanted visitor from the East | ||
| Eastern blight | ||
| Dreaded bug | ||
| Annual vaccine target |