The present epidemiological investigation was conducted as a case-control study, with controls taken from healthy neighbours of the cases. A quick clinical examination of the cases admitted to the hospital was done with an aim to narrow down to three to four differential/probable diagnoses. Based on this, appropriate samples for the necessary investigation were collected. These samples included biological samples for confirming the presence of a causative agent and its detectable form in the body as well as in the suspected source. The presence of the same causative agent in these suspected sources was essential to form the corroborative evidence in clinching the final diagnosis.
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