If you're a home care giver your highest chance of getting an infectious disease would be from getting stabbed by a needle or coming into contact with the person's blood. If you bath someone regularly, there could be a small (and I mean very small) possibility of getting an STD, but you should be wearing gloves during this. As long as you're practicing good hygiene and be wary of needles, blood, and bodily fluids you should be fine. Honestly you have a lower chance of getting infected than a nurse at a hospital does and my grandma has been a nurse for over 40 years.. she's only had 2 AIDs/ Hepatitis scares during this time and she administers shots, takes blood, and deals with a lot of bodily fluids on a regular basis.
By all means get another test done, but keep in mind that unless you develop a symptom of a STD or come into direct contact with bodily fluids you really have no reason to be worried.
Hi if you have no bodily contact with anyone then it is impossible i would say please Take care ..........Bob