TASK: EXPOSURE TO BIOLOGICAL AGENTS

$1.$The shareholders at WWA are increasingly concerned about the organisation$$s involvement in the handling and testing of bathing water samples. This work is attracting bad publicity and they have asked for an update to reassure them.

$($a$).$ Posts on social media from swimmers who swam at Green Valley Lake in the first two weeks of June, report that many have since been ill. The swimmers are reporting stomach pain, but others are more unwell.

$($Question$)$ Explain how these swimmers at Green Valley Lake have become ill.

Note: Your answer must be based on the information in supporting document $3$