My results for varicella titers were 4.9

is that positive or negative??
As one doctor told me, it depends.Your facility/school will tell you what level is considered acceptable.Titers are also very controversial. Some doctors believe that unless a titer is at a certain level, you do not have immunity. However, some doctors say that a low titer is not an indication of low or no immunity, because unless you are fighting an infection, the body has no reason to react.

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A link that may be helpful:Chickenpox and Shingles Tests: The Testand yes, do follow up with your PMD.