The bulk of cases are of the mild dengue fever type but the thousands of recovered patients over the years are a huge reservoir for deadly sequential infections. What does the bold part mean?
Thanks.
Top answer
It means that there is (via recovered patients) a large potential for subsequent or later infections.
— KatrinaB
It means that there is (via recovered patients) a large potential for subsequent or later infections.
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I believe "sequential" would be better as "subsequent."
Most people get only a mild form of the illness and recover. But all those people who had been ill and recovered form a large population of people who might get a more serious (deadly) form of infection later.