You will be given a definition of a task first, then some input of the task.
Generate an explanation for the given claim using the provided supporting material from the paragraph. Please consider the following points while generating an output. 1) The claim will always have supporting proof in the paragraph, and the paragraph will have a clear point of view supporting the claim. 2) There can be instances where direct correlation to the claim is not available. Make use of the sentences in the paragraph to provide a corresponding output supporting the claim. 3) The explanation should be at least one and at most twelve sentences long.

Paragraph: It said Thursday that two of the four were patients at Advocate Christ Hospital in Oak Lawn within the past two months. The agency says it will visit the hospital this week to test its water and that the hospital is working with it to strengthen its water management. The agency says it has recommended the hospital inform patients and families about Legionella bacteria and work to identify other potential cases of the disease. Water containing naturally occurring Legionella bacteria can be aerosolized through cooling towers, showers, hot tubs, and decorative fountains and, when inhaled, cause Legionnaire's disease, which is a serious lung infection. Claim: 4 cases of Legionnaires' disease investigated at hospital.
Output:
The Illinois Department of Public Health says it's investigating four cases of Legionnaires' disease in individuals at a suburban Chicago hospital.