You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "where was the first documented case of polio?" whose answer is 1840.
Each document should contain about 30 words, and these documents should contain useful information.

Query: first documented case of polio
Useful Output:

Doc 1: The disease had first emerged in the United States in 1894, but the first large epidemic happened in 1916 when public health experts recorded
Doc 2: Polio has existed since ancient times and was documented in the written record in the 18th and 19th centuries. There are three wild types of
Doc 3: The first successful vaccine was created by US physician Jonas Salk. Salk tested his experimental killed-virus vaccine on himself and his family in 1953.
Doc 4: A child receives an oral polio vaccine in India. A four-year-old girl from Jerusalem has been diagnosed with polio, Israel's Health Ministry
Doc 5: The first documented polio outbreak in the United States happened in 1894 in Vermont. This outbreak led to 132 cases of permanent paralysis.