It is semantics, but if one has thrush, then one is not asymptomatic.
Thrush becomes more common the lower the CD4 count is- that is the more weakened the immune system is- It occurs with a CD4 under 500- but becomes more severe and recurs more often the lower the CD4 ( unless anti-fungal therapy is given). It can also occur with initial infection.
But there are many other causes of thrush aside form HIV- including use of antibiotics, use of steroids ( both pills and inhaled steroids), diabetes and others.
There are other HIV related conditions one can get during earlier stages of HIV- like bacterial pneumonia, Tuberculosis and lymphoma- But again, this would make the person "symptomatic'.
I hope that helps.
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