The search in the database may be executed in the "Search" window. In the left half of this window is the table with recordset as a result of search. In the right half of the window there are the fields with query criteria. In these fields you should query criteria for the search in the database.
If you want to use by search result of the test (positive or negative), in the beginning you should click the appropriate button and activate criterion of search "Result of the test", and then click on the button "positive" or "negative".
Click on the button "search" for search. All retrieved records will displayed in the table at the left.
Double click for transition to current record in the "Patients" window.