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front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |21 |22 |review |
Y-axis: annual incidence, X-axis: age group |
The incidence was highest immediately after 1942, then it decline and then rose again. This might have been suggestive of the susceptibles being culled out of the population, and the next generation having a new set of susceptibles, that is why the incidence rose. |