Queries :: Extract One Record Per Unique ID

I have a table like so:

Code:
PatientID VisitDate Complaint TestPos
1 4/5/2003 Coughing 1
1 1/2/2007 Sneezing
1 5/1/2008 Unknown 1
2 2/1/1988 Unknown
2 4/2/1988 Unknown 1

I'd like to extract just one TestPos record (TestPos = 1) per Patient ID. And I always want to select the record with the earliest date. So the result would be:

Code:
PatientID VisitDate Complaint TestPos
1 4/5/2003 Coughing 1
2 4/2/1988 Unknown 1

I can do this but it requires 3 queries: a SELECT query where TestPos = 1, a GROUP BY PatientID query and MIN(VisitDate) to get the desired record per patient, and then another query that links the two so I can get the additional variables (e.g., Complaint).

Is there a way to do this without using 3 queries? Seems inefficient.