Canning is alarmed at March’s fever – he had “contracted river ague – the commonest of the region’s summer afflictions.” What happens?

Mr. March's illness begins with a bad headache and aching body. He soon starts shivering and suffers a high fever. When Canning discovers Mr. March still in bed, he considers him to be “gravely ill” (158). In response, the workers and Canning join together to help him regain his health. After two days of violent illness, March's fever breaks.